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Roof Sealant
Hi all. What roof sealant would you recommend?
LD 22', 1989 Custom Build. Chassis 1990 Chevy Van G30, 5.7l.

Re: Roof Sealant
Reply #1
Hi all. What roof sealant would you recommend?

For sealing the roof seams, search "Eternabond tape", it's what many of us have successfully used for years.
Once properly installed the tape will last a very long time, usually remaining the life of the rig.
Around the vents, top coat the existing sealant, after cleaning, with either 3M 5200 or a Dicor sealant.

Larry
Larry
2003 23.5' Front Lounge, since new.  Previously 1983 22' Front Lounge.
Tow vehicles  2020 Jeep Wrangler Rubicon, 2001 Jeep Cherokee
Photo Collection: Lazy Daze

Re: Roof Sealant
Reply #2
I have no personal experience with different sealants, but Lazy Daze currently uses Loctite PL Window Door & Siding Polyurethane Sealant. That is what they recommended we use when we were there on 12/20/18. I just joined this forum and started reading Larry's posts today. He clearly has a lot of experience with this, and provides a lot of good how-to advice in other posts. We plan to strip the old sealant and reseal with polyurethane, but the test section I started today proves that getting the old stuff off can get really sticky (literally.)
2001 MB

Re: Roof Sealant
Reply #3
I have no personal experience with different sealants, but Lazy Daze currently uses Loctite PL Window Door & Siding Polyurethane Sealant. That is what they recommended we use when we were there on 12/20/18. I just joined this forum and started reading Larry's posts today. He clearly has a lot of experience with this, and provides a lot of good how-to advice in other posts. We plan to strip the old sealant and reseal with polyurethane, but the test section I started today proves that getting the old stuff off can get really sticky (literally.)
Patricia, welcome to the Lazy Daze Owners' Group. We hope you find answers to all your questions here. What year and model Lazy Daze do you have?

Chris
Formerly: 2002 30' IB

Re: Roof Sealant
Reply #4
I can happen to answer this for her as I'm the lesser half (AKA the husband) :)

It's a 2001 MB
2001 MB

Re: Roof Sealant
Reply #5
. We plan to strip the old sealant and reseal with polyurethane, but the test section I started today proves that getting the old stuff off can get really sticky (literally.)

The easiest way to remove old sealant is with an oscillating tool, along with a razor sharp chisel blade.
Rockwell RK5142K 4.0 Amp Sonicrafter F50 Oscillating Multi-Tool, with...
Rockwell RW8921 Sonicrafter Oscillating Multitool Rigid Scraper Blade with...

The blade will get sticky, keep a rag and a can of either spray brake or carburetor cleaner at hand for rooftop clean ups.
Sharpen the blade when it gets dull or badly nicked.

Larry
As an Amazon Associate Lazy Daze Owners' Group earns from qualifying purchases.
Larry
2003 23.5' Front Lounge, since new.  Previously 1983 22' Front Lounge.
Tow vehicles  2020 Jeep Wrangler Rubicon, 2001 Jeep Cherokee
Photo Collection: Lazy Daze

Re: Roof Sealant
Reply #6
Larry’s suggestion for a quality multi tool is a must have.  Without an oscillating tool I don’t think it would be possible to do any repair on a Ld considering the amount of sealant they use on literally everything.

When I resealed I applied the 4 inch eternabond directly over the seals doing down the sides of the camper and layered it over the seal on the front cap. When going over the seals it’s best to remove any air bubbles in the current seals, I couldn’t see a reason to remove the original sealant as it was still doing its job and the eternabond lays down over it very nicely.

Personally I would put huge emphasis on sealing the end caps, and id forgo aesthetics and put eternabond tape over end cap seams.

As far as the vents and ladder goes, clean off the old seals and then just apply a nice level coating of dicor, I’ve personally removed a vent and I’m not sure how that would ever leak considering how thoroughly they are attached. Going over stuff with dicor is probably your best bet.
2000 RB

Re: Roof Sealant
Reply #7
When going over the seals it’s best to remove any air bubbles in the current seals, I couldn’t see a reason to remove the original sealant as it was still doing its job and the Eternabond lays down over it very nicely.

As far as the vents and ladder goes, clean off the old seals and then just apply a nice level coating of dicor, I’ve personally removed a vent and I’m not sure how that would ever leak considering how thoroughly they are attached. Going over stuff with dicor is probably your best bet.

Back when I resealed roofs, I would remove the seam sealant in spots where there were bubbles, and in spots where the Factory sealant has spread to wide to be covered with Eternabond, such as in the front corners, where bubbles are almost always found.
Before applying the tape, a thin, fresh layer of sealant was applied to the cleaned, old sealant, just over the seam to renew it.  The Eternabond tape was then applied, providing a second layer of protection.

During last year or so of sealing roofs, I switched from 4" wide tape to the 6" wide for better coverage over the old sealant. While it did provide superior sealing, it is much more difficult to deal with and took a lot of practice to get the technique worked out. The extra wide tape wants to fold onto itself and if it does, the section of tape must be cut out and replaced, it cannot be separated without stretching.
Beginners should stay with the 4" tape.

Larry
Larry
2003 23.5' Front Lounge, since new.  Previously 1983 22' Front Lounge.
Tow vehicles  2020 Jeep Wrangler Rubicon, 2001 Jeep Cherokee
Photo Collection: Lazy Daze

Re: Roof Sealant
Reply #8
Truthfully I found the eternabond tape pretty easy to work with, if you go slow and only remove the backer a foot at a time it’s pretty forgiving. I guarantee it’s less messy and easier to inspect and therefore trust than any liquid sealant.
2000 RB

Re: Roof Sealant
Reply #9
I don't want to hijack anything here but this seems like a pretty good place to ask.  I have to order everything in our neck of the woods, we have a 26 1/2 ' mid bath and I'm going to order the sealant for the windows and the back caps. Is there a gut feel of how far a 10 oz tube of the 5200 will go?  We have 8 windows plus the two back caps. I don't want to short myself but also don't want too much extra.

Thanks Jon.....
1994 MB

Re: Roof Sealant
Reply #10
If you are not planning to pull any windows, i.e. just resealing the edges, then I would still order at least two tubes of the 'fast cure'. Once open it does not keep well. I recommend you carefully mask both sides of all the seams before opening any tubes. Have LOTS of disposable gloves and paper towels handy. Finally read here all recommended practices for using the stuff without disastrous results.

Steve
2004 FL
2013 Honda Fit

Re: Roof Sealant
Reply #11
 
I have to order everything in our neck of the woods, we have a 26 1/2 ' mid bath and I'm going to order the sealant for the windows and the back caps. Is there a gut feel of how far a 10 oz tube of the 5200 will go?  We have 8 windows plus the two back caps. I don't want to short myself but also don't want too much extra.

I would start with two 10-oz. tube of 5200 FC. Any extra can be used to overcoat the roof, around the antennas, solar panel mount's and vents.

While 5200 FC can be bought at our local Lowes, I find it is usually cheaper to buy it online. Prices change so check out all the options before buying.
The smaller sizes are better for small projects. An open tube will solidify quickly unless it can be sealed air tight, hard to do. Less leftover is an advantage.
3M Marine Adhesive/Sealant Fast Cure (White, 10 fl.oz): Polyurethane...

If you are planning on overcoating the sealant on the vents and antennas, consider using Dicor, it works fine and is much cheaper than polyurethane.
Mike Sylvester introduced it to me 12 years ago at the Ballon Festival. When it came to knowing RVs, Mike was the man, a lot of us miss him and his wife Lisa.  They were a matched set.

Larry

As an Amazon Associate Lazy Daze Owners' Group earns from qualifying purchases.
Larry
2003 23.5' Front Lounge, since new.  Previously 1983 22' Front Lounge.
Tow vehicles  2020 Jeep Wrangler Rubicon, 2001 Jeep Cherokee
Photo Collection: Lazy Daze

Re: Roof Sealant
Reply #12
Thanks for the input all. Our nearest Lowes is an hour and a half but I might make a run for the heck of it. It's  snowmobile season so I don't want to waste too much time traveling. I figure I'll get my materials together and go for it when I get a chance. Will the 5200 flow from a decent calking gun? Larry thanks for the info, I joined this site because of our new to us LD but I have to say I really enjoy reading the information here and everyone's differing views. That being said we all have one thing in common, a Lazy Daze motor-home.
Thanks Jon....
1994 MB

Re: Roof Sealant
Reply #13
Our nearest Lowes is an hour and a half but I might make a run for the heck of it. It's  snowmobile season so I don't want to waste too much time traveling. I figure I'll get my materials together and go for it when I get a chance. Will the 5200 flow from a decent calking gun?

A good calking gun works fine with fresh sealant, keep the product warm to reduce the strain on your hands.
3M 5200 Fast Cure skims over quickly, don't wait too long to remove the masking tape.

Larry
Larry
2003 23.5' Front Lounge, since new.  Previously 1983 22' Front Lounge.
Tow vehicles  2020 Jeep Wrangler Rubicon, 2001 Jeep Cherokee
Photo Collection: Lazy Daze

Re: Roof Sealant
Reply #14
Tried to post this a few days ago to a old thread but timed out and couldn't find the draft...
FYI, no known, available solvent will dissolve cured polyurethane. Solvent is only useful for cleaning the surface of old polyurethane.

Hi Larry, I am now embarking on a roof re-seal on my own. We had Vince at the Mothership look at the roof for us before we left CA with our "new" 2001 26.5MB. He said it was the original sealant and should have been done about 7-10 years ago. He said "you can do it yourself" when you get home, just make sure to get ALL the old stuff off, down to clean aluminum/plastic (front) or firm paint, first by scraping, then using acetone to remove any remnants/residue. On 1/6/19 I worked for about 2 hours with hand tools and a hair dryer and managed to remove about 1 foot of old sealant. Then I decided to do some research here in the Forums. THANK YOU ALL FOR THE GREAT TIPS!

Follow up today:

Monday morning I went shopping again... LOVE my new Rockwell Oscillating Multi-Tool! (thanks for the suggestion Larry) Works beautifully between the old 2001 sealant and the alu roof, but not as well on the plastic cover along the front. Maybe it is the angle I have to work from, the screws, and the lack of experience, but it seemed that light heat (hairdryer) and pulling worked better on the plastic. Heat and pulling literally separated sealant from the plastic with no remaining residue on day 1's test strip.

Here is how the test area went with photos I'm putting this in a google album because "save draft" says that it won't save attachments: LD 2001 26.5 MB Roof Reseal - Google Photos
You can see the descriptions of the process if you double click the first photo and then step through them one at a time. Apparently google albums don't have photo subtitles. 

These are the products I am using:
Rockwell Oscillating Multi-Tool for scraping the old sealant.
Hairdryer & plastic scraper & pulling to remove old sealant from plastic fairing.
Klean Strip KWIK-STRIP Fast Paint & Varnish Stripper, brush on, let sit for 15-45 minutes, then scrape with rigid metal beveled edge 1-1/4" scraper.
Klean Strip Paint Stripper After Wash & rag, to wipe surface clean.
Acetone & rag to wipe surface again (recommended by Vince at the Mothership before applying new sealant.)
Loctite PRO LINE Window Door & Siding Polyurethane Sealant and flexible plastic 2" blade.
2001 MB

Re: Roof Sealant
Reply #15
Tried to post this a few days ago to a old thread but timed out and couldn't find the draft...
Hi Larry, I am now embarking on a roof re-seal on my own. We had Vince at the Mothership look at the roof for us before we left CA with our "new" 2001 26.5MB. He said it was the original sealant and should have been done about 7-10 years ago. He said "you can do it yourself" when you get home, just make sure to get ALL the old stuff off, down to clean aluminum/plastic (front) or firm paint, first by scraping, then using acetone to remove any remnants/residue. On 1/6/19 I worked for about 2 hours with hand tools and a hair dryer and managed to remove about 1 foot of old sealant. Then I decided to do some research here in the Forums. THANK YOU ALL FOR THE GREAT TIPS!

Follow up today:

Monday morning I went shopping again... LOVE my new Rockwell Oscillating Multi-Tool! (thanks for the suggestion Larry) Works beautifully between the old 2001 sealant and the alu roof, but not as well on the plastic cover along the front. Maybe it is the angle I have to work from, the screws, and the lack of experience, but it seemed that light heat (hairdryer) and pulling worked better on the plastic. Heat and pulling literally separated sealant from the plastic with no remaining residue on day 1's test strip.

Here is how the test area went with photos I'm putting this in a google album because "save draft" says that it won't save attachments: LD 2001 26.5 MB Roof Reseal - Google Photos
You can see the descriptions of the process if you double click the first photo and then step through them one at a time. Apparently google albums don't have photo subtitles. 

These are the products I am using:
Rockwell Oscillating Multi-Tool for scraping the old sealant.
Hairdryer & plastic scraper & pulling to remove old sealant from plastic fairing.
Klean Strip KWIK-STRIP Fast Paint & Varnish Stripper, brush on, let sit for 15-45 minutes, then scrape with rigid metal beveled edge 1-1/4" scraper.
Klean Strip Paint Stripper After Wash & rag, to wipe surface clean.
Acetone & rag to wipe surface again (recommended by Vince at the Mothership before applying new sealant.)
Loctite PRO LINE Window Door & Siding Polyurethane Sealant and flexible plastic 2" blade.

Good job.
I used Eternabond tape.
Now I'm wishing I had just done this instead as the tape won't last forever and I shudder at trying to remove it.
2021 Mid Bath

Re: Roof Sealant
Reply #16
Fun fact, eternabond tape can be peeled off, and then a new piece put right back down, the grey sealant residue will literally join with the new piece of tape so there’s no reason to worry about removing it.
2000 RB

Re: Roof Sealant
Reply #17
Fun fact, eternabond tape can be peeled off, and then a new piece put right back down, the grey sealant residue will literally join with the new piece of tape so there’s no reason to worry about removing it.

I thought the factory wouldn't touch it because getting the eternabond off is such a pain? I've no experience with it, just what I've read. Does it really peel off pretty easy?
2001 MB

Re: Roof Sealant
Reply #18
Good job.
I used Eternabond tape.
Now I'm wishing I had just done this instead as the tape won't last forever and I shudder at trying to remove it.

If the job was done correctly, you shouldn't have to worry about this for a very long time, probably longer than you will own the rig..
I have seen the same roof tape used in commercial buildings that were over 25 years old and it was still in good shape.
Eternabond tape was originally developed for sealing the seams on flat membrane roofs. It's tough stuff.
If you had used polyurethane sealant instead, it will probably need replacement before the Eternabond tape.

Stop worrying!

Larry
Larry
2003 23.5' Front Lounge, since new.  Previously 1983 22' Front Lounge.
Tow vehicles  2020 Jeep Wrangler Rubicon, 2001 Jeep Cherokee
Photo Collection: Lazy Daze

Re: Roof Sealant
Reply #19
Basically the white backing of the eternabond will peel up but plenty of the grey residue sealant will be left over, from what I understand removing the excess is difficult but if replacing the eternabond it will gladly go over the residue and you will have just as good of a bond.
2000 RB

Re: Roof Sealant
Reply #20
Hi again all, I'm going to revive this for a little more info. Earlier on in this topic I was going to seal the windows and end caps. This is now done and I'm moving on to the roof. I've been surveying my project and I have made all my decisions except one and I need a little info. At the seam at the front cap the previous owner used some Dicor to overlay the joint and his job is intact although I thought he was a little stingy with it. So here is my question and then I'll move on. Is there a problem using Eternabond over the well cleaned Dicor that is still intact? Will it adhere with out worries? Thanks in advance, all your advice has worked flawlessly. Oh and by the way 2 tubes of 5200 was the right amount for the windows and end caps. I have an extra just in case.

Jon.....
1994 MB

Re: Roof Sealant
Reply #21
At the seam at the front cap the previous owner used some Dicor to overlay the joint and his job is intact although I thought he was a little stingy with it. So here is my question and then I'll move on. Is there a problem using Eternabond over the well cleaned Dicor that is still intact? Will it adhere with out worries?

I wouldn't count on the Eternabond tape sticking to the Dicor. If you want to tape the seam, the DIcor will need to be removed.
I usually cut the sealant in the front corners away, many times finding bubbles full of dirt and water.

Larry
Larry
2003 23.5' Front Lounge, since new.  Previously 1983 22' Front Lounge.
Tow vehicles  2020 Jeep Wrangler Rubicon, 2001 Jeep Cherokee
Photo Collection: Lazy Daze

 
Re: Roof Sealant
Reply #22
I wouldn't count on the Eternabond tape sticking to the Dicor. If you want to tape the seam, the DIcor will need to be removed.
I usually cut the sealant in the front corners away, many times finding bubbles full of dirt and water.

Larry
Larry, do you remove the sealant all the way across or just at the corners? Could a guy clean up the corners and reseal with 5200 then give a good coat of Dicor. Ours seems to have a metal strip across the front joint, the length wise sides I'm sure can be cleaned and taped. I guess I'm trying to avoid removing everything if it looks good. Thanks,

Jon
1994 MB

Re: Roof Sealant
Reply #23
do you remove the sealant all the way across or just at the corners? Could a guy clean up the corners and reseal with 5200 then give a good coat of Dicor. Ours seems to have a metal strip across the front joint, the length wise sides I'm sure can be cleaned and taped.

The Factory seam sealant, in the front corners, is spread widely and is one of the reasons why I removed the sealant in the corners, to allow the tape to stick.
 As mentioned, the front corners of the roof seam is where I have found problems, in the form of cracks and bubbles. The area is evidently highly stressed and has some flex. LD seals the roof with a sealant having a very long cure time.
It's possible that many rigs are driven away before the sealant fully cures, the corner flexing causing bubbles to form. I know some of the sealants in our LD were not cured when we pick it up and, several years later, I found bubbles in the front corners of the roof's sealant.

The day after picking our LD, I removed the old-school bathroom fan and several roof handrail stanchions, finding the sealant still sticky and not fully cured. Not being cured made the project a lot easier.
Some polyurethane sealants have a week, or longer, cure time. Usually, the longer the cure time, the stronger the ultimate strength.

Once the Factory seam is covered with a another sealant, who knows how it will stick together, in a year or two.
If you have access to a vibratory tool and sharp blade, I would cut the corners out and redo them with 5200 FC.
In doubtful areas, I suggest removing all the sealant and. It's more work but do you want to do it again, anytime soon?

Larry
Larry
2003 23.5' Front Lounge, since new.  Previously 1983 22' Front Lounge.
Tow vehicles  2020 Jeep Wrangler Rubicon, 2001 Jeep Cherokee
Photo Collection: Lazy Daze

Re: Roof Sealant
Reply #24
A short time after I took delivery of my 2003 TK, I went on to the roof to check everything. I noticed that the seam between the fiberglass front cap and the aluminum roof sheet was bubbling and water and dirt was oozing out from under the sealant. I scraped out the goop, cleaned the area thoroughly, dried it, then re-sealed the gap with whatever LD was using at the time. When I learned about Eternabond later, I cleaned the area again and applied the tape. Over time, the E-bond acquired a few nicks and scratches; when I E-bonded all the seams a few years later, the front seam got another strip, including the corners.

That front seam was a problem area in many rigs; it's a very good idea to check this carefully, particularly in the Lake Newton region!
2003 TK has a new home