CRC Seal Coat Red Urethane Coating, 11 Wt Oz, (Pack of 12), 18410CS

I wanted to seal several PCBs from not just water and general contamination, but from stopping the solder being a problem to anyone as I had needed to use solder that contained lead for these.I searched for "conformal" coating and read the reviews - This seemed an excellent choice and yet again, the reviews saved me so much time and wasted money as it works perfectly. Yes there is a strong solvent smell and it is highly inflammable as it dries out, but that is normal with all conformal coatings and cannot be avoided as it needs fairly aggressive solvents to dissolve the plastic the coating is actually made of.The real test is durability, even with a single light coat, the boards have all come out perfect, with no problems I could see, even using x30 magnification on the PCBs.I don't know how it compares to other brands price-wise, but does it matter? One single vulnerable PCB will cost you a lot more than you could ever save (unless you are running a production line)! I am staying with CRC now as it has been better than other brands I have used before.

I used this on an aluminum strip led (sold as an automotive accessory https://www.amazon.com/gp/product/B017341TQE/ref=oh_aui_search_detailpage?ie=UTF8&psc=1 ) to waterproof it for use underwater in a pool. It works great. I probably did overkill, giving it many, many coats, but it still did not get too thick. BTW, even with many coats, it did not discolor too much - maybe a little yellowish, but did not seem to alter the light output. Depending on how much protection you need, a thin layer should work fine.

Leaves a nice quick drying coating.Cons:- smells awful. I always go outside for using it, and need to leave the item with a fresh coating outside for a few minutes before taking it back in.

I use this on any electronics that are for outdoor use and which the electronics can be easily accessed.Here in hot/humid/sunny Florida the elements are totally at odds with electronics and anything you can do to protect them is cheap insurance and a step toward extending their lifespans. One of the worst culprits are the dang ants, which seem to be attracted to electronics. In the past I have had them ruin lots of electrical products by building their nests inside things.Some things you can easily just seal the entire device and make it impervious to the ants, while others can not. For those devices that can't be sealed, protecting the interior electronics with this kind of conformal coating goes a very long way toward keeping all the fluids/acids from ants away from the fragile electronics.Well worth the price and time it takes to use it!

I had to replace a MOSFET on a generator and the board was originally coated due to being outside. I purchased this to touch up the board after repairs. I applied a few coats to build it to the same thickness as the original coating. It sprayed well even though I was working outdoors in high humidity. The end coating was crystal clear and seems very durable.

The nozzle clogs very easily despite shaking the can.

For general PCB waterproofing I would imagine it would work well. However I do not recommend for sealing LED's or anything that gets slightly warm. Five days after coating and sealant still puts off noxious fumes once temps get above 100 °F.When applied, the spray acted like a dry, sticky powder. Each particle seemed to keep its shape even when in contact with another particle (as opposed to spray paint where each droplet merges with the next creating a solid layer). This ended up making a large amount of dust like structures and required multiple applications to MAYBE achieve one uniform coating. Maybe I got a bad can, but I would hesitate applying this to any slightly larger project that needed absolute protection.In the picture you can see the dust structures. I also included a small piece of the epoxy coated LED strip for a before/after reference. The coating has since yellowed fairly significantly.

This stuff Works great! I mill my prototype circuit boards out on my CNC mill and for testing purposes I usually don't need to worry about any sort of coating or weather resistance.Well I needed a way to make some of my circuit boards water resistant for testing outdoors (these control a series of solar panels)and this did the trick, I sprayed a couple layers on each board, It goes on thick and seals up around the larger components.I tested it by powering one of them on and dunking it under water. It continued to function properly and I am very pleased with it.