MG ChemicalsMG Chemicals - 419D-55ML 419D Premium Acrylic Conformal Coating, 55 mL Bottle, IPC 830, UL 94V-0 (File # E203094), Clear, 1.86 Fl Oz (Pack of 1)

Wear safety goggles. Very strong order, so use in a fan vented area. I coated both sides of an 8x4 inch (200x100 mm) PCB (for a washing machine) in a small bathroom with a vent fan on and it didn't stink up the house. Make sure the PCB is TOTALLY clean else the coating will pull back and leave uncovered spots. I use 95+ Isopropyl Alcohol with an Acid Brush (bristles cut to a stiff 1/4 inch or 6 mm) for cleaning and let it air dry. Make sure the board is above 60 F (16 C) and in less than 50% humidity for at least a day... you don't want to trap moisture in the board. It works well with an Acid Brush with 3/4 inch (18 mm) bristles. I applied the coating in one very thick coat, but two thinner coats may be better. The coating self levels and fully dried in 30 minutes (one side at a time). It is crystal clear and durable. Time will tell if it keeps corrosion at bay in a humid area like a wash room.

Dries FAST. Has a slight color hue in the glass bottle, reminds of high quality Aerospace coating. Used it on a circuit board in a salt air environment. Time will tell.

I use this coating on PCBs that are milled on a CNC. Sealing these PCBs makes sense as I live in a high humidity environment. This material dries to the touch in about 30 minutes, but I give it 24 hours to fully cure.VERY IMPORTANT:1) Heed the WARNINGS re the very flammable vapors and DO NOT breathe this stuff as it's quite dangerous. But, after it cures, the VOCs decrease enough that I can barely smell any.2) Wear a respirator (Do NOT use a N95/KN95/surgical type mask), even if using outdoors. Also, wear safety glasses, and gloves (I use Nitrile) when applying.CLEANING: As noted, there are 2 included brushes. However, I use "acid brushes" (you can buy these in bulk) and both 70% and 99% isopropyl alcohol to clean the acid brushes. You'll need to use a paper towel and work the brush end to get the coating to "glob" up and detach from the brush. It's a bit of work, but you can reuse a brush several times. Handy Hint: Acid brushes tend to have 3/4" bristles. I cut these down to a tighter 1/4" for more accurate application.Have fun, but be safe!Picture: This closeup shows what a coated and non-coated area looks like after curing. When wet it has a slight pinkish tinge but, as shown, it dries clear.

Used the acrylic conformal coating to protect several circuit board in a 2000 Chevy Blazer automatic A/C control module. These control modules are very susceptable to printed circuit board (PCB) corrosion. The coat applies nicely and self levels. Hopefully, the risk of module failure due to PCB corrosion has been greatly reduced.

This product is not suited for shipping. First shipment leaked out about 1/2 the bottle, such that I thought it was broken and sent it back. Amazon told me to throw it away, so I put it with my recycle paint. The replacement package had the same problem, the packaging was contaminated with the conformal coating as about 1/3 leaked out. Between the two, I got one full bottle but all of the brushes were ruined. Good product, just not fit for shipping. Buy it at a electrical supply store instead.

I recently had to do surgery on the electronic board on my range as the broil element fried and it burned the solder joint where the broil relay is. a new relay was $1.61 and is greatly economical as opposed to board replacement. The Premium Acrylic Conformal Coating allows me to do that much more of a quality repair.

Dries fast

There are different conformal coatings. The manufacturer has some pdf with comparisons...This is the acrylic type. So "not flexible" like a silicon type might be.This is basically some "acrylic transparent nail polish", only with some "terribly dangerous chemicals", and well known and understood characteristics. i.e. this will NOT conduct electricity...There was NO brush in the cap, only 2 separate nylon brushes. The brush will become hard, but supposedly once put in the liquid again should become soft again. (acetone / nail polish remover could likely clean them up).Do use this in a VERY WELL VENTILATED place. In your garage for instance is not a bad idea if you have one.I used this to protect parts of a cpu I was deliding and adding liquid metal as the heat conducting material.I put 2 thin layers to protect all contacts, as well as make some kind of a "moat" around the silicon cpu.it's totally worth it.If you have some remote control car/plane/quadcopters... you can consider this one, but I think the silicon based might be better to protect your electronics from water due to the vibrations involved.