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 circuits like a pro—clear, certified, and cutting-edge!

ECO FRIENDLY FORMULA - No toluene or xylene—breathe easy with a coating free of hazardous air pollutants.
EFFORTLESS MAINTENANCE - Solder directly through the coating or remove it cleanly with MG Chemicals’ specialized strippers.
FAST DRYING EFFICIENCY - Get your projects done quicker with a premium acrylic coating that dries fast without compromising durability.
CRYSTAL CLEAR PROTECTION - Show off your tech with a smooth, semi-gloss finish that’s easy to inspect under UV light.
CERTIFIED SAFETY ASSURANCE - UL 94V-0 flame retardant rating means your electronics meet top-tier safety standards.

MG Chemicals 419D-55ML is a premium acrylic conformal coating designed to protect electronics from moisture, corrosion, and static discharge. It features a crystal-clear, semi-gloss finish that fluoresces under UV light for easy inspection. Certified UL 94V-0 for flame retardancy and free from hazardous solvents like toluene and xylene, it offers fast drying and easy reworkability, allowing soldering through the coating or removal with specialized strippers.

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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	1.85 ml (Pack of 1)
Color	Clear
Finish	Semi-Gloss
Item Package Quantity	1
Measurement System	Metric
Coverage	1
Special Features	Fast-Drying
Specific uses	Interior/Exterior
Included components	2 brushes
Batteries Required?	No

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)

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