What is the shelf-life of something like this? Will it stay usable if I buy this and don't use it until I need it for a long while off?

I have never had good luck with Acrylic coatings. it seems that once you open up the bottle a couple of times the air gets to it and it will thicken up in the bottle in a few months. If you want to have a long shelf life, I would use the Urethane conformal coatings instead. MG Chemicals sells them too.

I just bought this and it didn't come with a brush cap. Just two brushes sperate in the pack? Anyone get the brush cap lately?

I didnt get the brush cap either. I had to take it from my old bottle. Two brushes is stupid imo. They will just dry up

Does it effect led output when coated over led lens? I want to use on an led grow light to waterproof but I don't want to reduce the light output.

It is a clear coating, so no visible affects on LEDs, yet silicon coating is recommended for LEDs depending on the temperature.

How is this different from 422B?

422 is silicone in a spray can, 419 is acrylic in a bottle. The spray can is very convenient if you don't mind overspray, you are coating a large area, and want to coat everything in that area. The material in a bottle allows you to precisely coat areas you want to be coated without contaminating other areas. Acrylic tends to make a harder surface and be mechanically tough. Ink, glue, and sticky labels adhere better to acrylic. Silicone is more resistant to solvents like alcohol and gassoline. Silicone is also more flexable and less likely to crack under impact, though it is more easily cut.

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🛡️ Protect your tech with clarity and confidence!

CRYSTAL CLEAR FINISH - Delivers a smooth, high-gloss acrylic coat that preserves the sleek look of your circuit boards.
UV ACTIVATED INSPECTION - Fluoresces under black light, making quality checks and troubleshooting faster and more precise.
CERTIFIED SAFETY ASSURANCE - Meets UL 94V-0 standards for flame resistance, ensuring your electronics stay protected and compliant.
EFFORTLESS REWORK REPAIRS - Solder through the coating or easily remove it with MG Chemicals’ specialized thinners—no hassle, no downtime.
MOISTURE CORROSION SHIELD - Guards sensitive electronics against moisture, corrosion, fungus, and static discharges for long-lasting reliability.

MG Chemicals 419D-55ML Premium Acrylic Conformal Coating offers a crystal-clear, fast-drying protective layer for electronic circuit boards. Certified UL 94V-0 flame retardant and free from hazardous air pollutants, it shields electronics from moisture, corrosion, fungus, and static. Its UV-fluorescent property enables quick inspection, while easy rework options keep your projects flexible and efficient.

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Manufacturer	MG Chemicals
Part number	419D-55ML
Item Weight	50 g
Product Dimensions	7.68 x 24.32 x 5.12 cm; 50 g
Item model number	419D-55ML
Size	55 ml (Pack of 1)
Colour	Clear
Finish	High-Gloss
Material	Acrylic
Item Package Quantity	1
Coverage	1
Special Features	Fast-Drying
Specific uses	Electronic Circuit Boards and Components
Batteries Required?	No

MG Chemicals 419D-55ML Premium Acrylic Conformal Coating, Clear

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