Waterproofing a LED driver

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YuvalS's picture
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Waterproofing a LED driver

I have an Idea to use epoxy glue to waterproof a 8*1753 driver.
I am planning to use Poxipol epoxy.
Apart from the obvious problem that I will not be able to make any changes in the driver.
Do you see any issue with it, such as heat transfer, chemical reaction between the glue and the PCB, corrosion etc.?

Joshk's picture
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Potting electronics with epoxy has been a thing for a long time. The main concern is usually the effect of added capacitance on high speed signals, even PWM signals. But you don’t know till you try.

Barkuti's picture
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I presume the driver board will be attached to something in the usual way, to allow it to cool down. Whether this way or not, using thermal glue may be a wise choice. Thermal glues transfer heat better than epoxy, and can be easily removed. In my experience:

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Lightbringer's picture
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Is it just for waterproofing, or actual potting?

For just waterproofing, a conformal coating can be used. There are sprays and dips with silicone, polyurethane, other stuff, that works great. Also lets you get the edges of the fiberglass board so water doesn’t seep inside from the sides. Eg, https://miller-stephenson.com/chemicals/conformal-coating/ (good stuff).

For actual potting, you can get rigid or flexible compounds. Flexible is probably better, because it can “give” under thermal stress. (Think of a topped-off and sealed bottle of water that’s put into a freezer.)

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I’ll suggest about the same thing as Barkuti, a thermal glue made from silicone. Or just straight Homedepot 100% silicone. Probably will not be as easy to remove as the Fujik.
I have used Fujik Silicone Thermal glue a few times for this purpose and it works well and can be removed later but a pain in the Bu**.
I dont know where to get it now but mine came from Fasttech. https://www.fasttech.com/product/1049304-fujik-heatsink-silicone-thermal...

YuvalS's picture
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I want to use epoxy since it will be part of the light's body (host) so it has to be hard and to provide mechanical protection in addition to water protection