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Topic: Silicone coating circuit boards (Read 110 times) previous topic - next topic
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Silicone coating circuit boards
I read that coating the fan circuit boards with silicone MC can protect them from moisture and prolong their usage. So I bought a can of the spray, but I see you can also buy the liquid. I first disconnected the circuit boards from my two Maxxfans. I cleaned them with qtips and alcohol. I taped off all the connectors to keep the coating off.  Outside, I sprayed both sides every 30 minutes. I put on about 7 coats. They look pretty good so I’m going to go ahead and reinstall them. I have read protecting a circuit board with a coating of silicone MC is a really good idea if you have a fan right above your shower.
SoCal-Gal  (Tracy)
1991 26.5 RB
Previous 1988 22’ LD Multi plan
Previous 1992 Six-pack Camper
Spare the sealant, spoil the job.
Travelers: Tracy, spouse Anthony, Coton de Tulear, Gabby and parrotlet, Indigo
Re: Silicone coating circuit boards
Reply #1 –

The contacts on the various  plugs can be protected with a coating of dielectric grease, great stuff for moist and corrosive environments. I have used it for decades to protect plug contacts, plus other uses.
Amazon.com: Permatex 22058 Dielectric Tune-Up Grease, 3 oz. Tube: Automotive

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: Silicone coating circuit boards
Reply #2 –
Nice job SoCal-Girl.  I don’t think I would go through the exercise of conformal coating the fan board myself, but what you’ve done will protect against mold contaminating the electronics.

Many years ago I worked for a company that designed and manufactured circuit boards that were used in all kind of industries and environments.  Some of those industries were in very harsh environments like refineries and chemical plants while others were just wet and humid environments like food processing plants.  Conformal coating was a very popular option to protect the electronic components.  After the boards were populated with the components, the company would actually dip the board in conformal coating.  Of course it made for a real pain in the a** to rework the boards after coating.  I remember the repair and rework folks had to use MEK, which is a very caustic and dangerous chemical, to cut through the coating before trying to replace and solder any components.  I always stayed away when they were doing that 😉

- John
Fulltimer with a 2021 MId-Bath “Babe”, 1996 Cherokee “Scout” and “Bandit” the wonder dog 🐶