MG 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.

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.

I highly recommend this if you need to coat PCBs. The spray bottles always suck! I bought 3 spray bottles, and they all had the same issue- they squirt out big globs of liquid acrylic, making a huge mess and covering your fingers.This stuff comes in a bottle with 2 brushes. I did a large number of boards, so I used a cheap brush and mini paint try from home depot to brush this stuff on. It's solid in about 15 minutes, whereas the other brand I used took 24 hours to be touchable. Far less fumes as well vs. a spray.

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.

Seems like it will work fine. Applied ok with small brushes (2x) supplied. But there are zero instructions for use. Plenty of warnings, but no how-to. Very strong smell, so plan on that.

I just needed a little of this to cover some contacts and connections to prevent water corrosion. So far it's working. Just wish they had a smaller bottle of it.

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.

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.