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

Top Replies

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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14rhb over 5 years ago

I agree with several of the previous comments, use several approaches if you want this beacon to last a long time outdoors.

Surprisingly after opting for a waterproof box, unless you buy very high quality IP68 rated connectors (which can cost a lot of money), you will need an open drain hole in the bottom of the enclosure.

Continuous cycling of heat/cold during day/night and differing air humidity will bring moisture into your enclosure. You could heat the board with a resistive load off the PSU but the moisture will still condense in certain conditions in the case and puddle...hence the drain.

I've often used twin-tube syringe expoxy resin to coat a PCB and the components successfully, particularly useful in keeping moisture out of my LED strings on LED Firework Suite - the details
which without the epoxy soon managed to attract moisture, the timing went and the LED pixels started to malfunction.
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14rhb over 5 years ago

I agree with several of the previous comments, use several approaches if you want this beacon to last a long time outdoors.

Surprisingly after opting for a waterproof box, unless you buy very high quality IP68 rated connectors (which can cost a lot of money), you will need an open drain hole in the bottom of the enclosure.

Continuous cycling of heat/cold during day/night and differing air humidity will bring moisture into your enclosure. You could heat the board with a resistive load off the PSU but the moisture will still condense in certain conditions in the case and puddle...hence the drain.

I've often used twin-tube syringe expoxy resin to coat a PCB and the components successfully, particularly useful in keeping moisture out of my LED strings on LED Firework Suite - the details
which without the epoxy soon managed to attract moisture, the timing went and the LED pixels started to malfunction.
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Vote Up +3 Vote Down

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