Help need a way to waterproof a board

I have no idea where to ask and I cant find a way to waterproof a board , I have seen videos only of sum liquid you can brush on and make it water proof but don't know where

the board wont be under water but water can rain on it so would like to coat it to stop it failing after I clean it

thanks for any guidance

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michaelkellett over 5 years ago in reply to craigst +7

You could paint it with several coats of conformal coating, check out Humiseal. Farnell have quite a range of other products. (Watch out, many use toxic solvents.) Pick the one that suits your device best…
jw0752 over 5 years ago +6

Hi Craig, When they really want to protect electronics they POT the circuit which is basically encasing the whole thing in epoxy or some other substance like acrylic. This is often done for automotive…
phoenixcomm over 5 years ago +6

craigst potting SUCKS we used it in the military :{ why not just get a small waterproof box with a latching lid, I have on for my ultrasonic parking detection thing just under my front bumper. No-Fuss…

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phoenixcomm over 5 years ago

craigst potting SUCKS we used it in the military :{
why not just get a small waterproof box with a latching lid, I have on for my ultrasonic parking detection thing just under my front bumper. No-Fuss, No-Muss!
They come in all sizes and sometimes you score them at tradeshows (free) they hold biz cards. (low)
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phoenixcomm over 5 years ago

craigst potting SUCKS we used it in the military :{
why not just get a small waterproof box with a latching lid, I have on for my ultrasonic parking detection thing just under my front bumper. No-Fuss, No-Muss!
They come in all sizes and sometimes you score them at tradeshows (free) they hold biz cards. (low)
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craigst over 5 years ago in reply to phoenixcomm

I would but its the beacon unit its self no much room as 2 inchs thick im going to try seal it from water but want to see if there's a liquid spray or paste I can add to stop water shorting it out
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michaelkellett over 5 years ago in reply to craigst

You could paint it with several coats of conformal coating, check out Humiseal. Farnell have quite a range of other products. (Watch out, many use toxic solvents.)

Pick the one that suits your device best.

You need it to stick to the thing you are coating - so to start with your boards must be clean (chemically clean that is, not just looks OK).

Wires are a big problem !

For true waterproofing put it in a sealed box with a drain, conformally coat the board, pray.

In production you can substitute a lot of testing of many samples of parts and process for the praying.

For a home brew 1 off, CH is right, the box may leak but you can get at the works to fix things.

MK
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phoenixcomm over 5 years ago in reply to craigst

craigst
ok, what are the dimensions?? Small boxes are cheap!
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