I have been using the 422B version of this product for years and have been completely happy with the results. How does the new 422C version compare?

Works the same and was cheaper, package included 2 brushes for applying it.

Will this make a flexible coating for headphone wires?

No, this product is for water proofing components on a board that is not exposed to regular handling or significant flexing. You need to look at heat shrink tubing or brush on insulation. Heat shrink tubing is probably the best choice depending on what you're trying to do.

Can you use this on an led light over an aquarium? is it toxic after it cures? how long does it last? do you have to keep reapplying it?

I wouldn't put it in an aquarium's water just to be safe, but if trying to stop short circuits in a wet environment- that is what it does if applied correctly and completely covering circuitry, connections etc. Water doesn't seem to degrade an application by itself, physical wear from handling can happen, but it is very durable otherwise and not needing re-coating. Use UV light to see if coverage is complete as it Floreses blue/green so can inspect.

can i paint this on a motherboard to resurface if i scratched the green coating that covers a board?

It will cover it to prevent any shorts, yes. It is conformal coating. I prefer the UV curable type, but it will work.

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Description

🛡️ Shield your tech with the ultimate invisible armor!

UV FLUORESCENCE - Easily inspect your coating under UV-A light for flawless coverage and quality assurance.
RAPID HANDLING TIME - Ready to handle in just 10 minutes—speed up your workflow without compromise.
PRECISION APPLICATION - Validated for selective robotic coating—perfect for high-tech manufacturing and consistent quality.
MULTI THREAT PROTECTION - Shields electronics from moisture, dust, corrosion, static discharge, and high-voltage arcing.
THERMAL SHOCK RESILIENCE - Withstands extreme temperature swings up to 200°C, ensuring durability in harsh environments.

MG Chemicals 422C Silicone Conformal Coating is a fast-curing, flexible protective layer designed to safeguard electronics from moisture, corrosion, dust, thermal shock, and electrical hazards. With a high service temperature of 200°C and UV fluorescence for easy inspection, it’s ideal for professional-grade electronics manufacturing and repair, delivering reliable protection and quick turnaround.

Specifications

ASIN	B085G42TGS
Best Sellers Rank	#48,532 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #133 in Silicone Sealers
Brand Name	MG Chemicals
Color	clear" or "transparent
Compatible Material	Metals, Plastics, Ceramics
Container Type	Bottle
Customer Reviews	4.7 4.7 out of 5 stars (999)
Full Cure Time	24 Hours
Included Components	2 Brushes
Item Form	Liquid
Item Package Quantity	1
Item Type Name	Protective Coating
Item Weight	50.7 Grams
Manufacturer	MG Chemicals
Material Type	Silicone
Model	422C-55MLCA
Other Special Features of the Product	Fluoresces under UV-A light, Validated for selective robotic coating equipment
Specific Uses For Product	Electronics Manufacturing, Industrial Settings
UPC	779008422069
Unit Count	55 Milliliters
Viscosity	Moderate
Volume	55 Milliliters
Water Resistance Level	Water Resistant

Reviews

D**4

I have done no scientific testing whatsoever with this coating. I can’t tell you from real world experience of building 15 to 20 drones that this coating will extend the life of your components , it’s excellent with heat really good with moisture and it doesn’t stress out your boards when curing like some coatings . This stuff you can paint a board then handle the board and install it all in about 10 or 15 minutes I believe this is a must have if you live in the southern hemisphere of the United States for moisture alone. I have lost a lot of boards to wet grass on a crash. I can tell you that I also use this on my VTX’s , receivers ,GPS Antanas , LEDs whatever I have seen no downside to this product.. what I do is lightly paint the board when I receive, Then do my soldering ,and my installl ,my wire placement everything . Then test everything then Before I button it up I’ll paint the top side of the board for sure sometimes the bottom again just to help with things like loosing pads or wires and I use as a light glue to help wires stay in place . I’ve built a lot of drones and I believe this is a must have for a builders toolbox. This coating is easy to apply and really does go a long way before running out . Only downside was I gobed a bunch is USB port then had to clean it out befor I could connect to beta flight , but that was user error. What I do now is shove a little silly putty in the USB port before painting then pop the putty out when done . I highly recommend this product . The odor is strong use in well ventilated area .

8.11.2021

B**H

Great product. Had an issue with moisture contact to my controls, shutting down my washing machine . Quick, cheap solution!!

16.01.2026

T**T

Works exactly how it’s intended to

23.02.2026

F**S

Top-quality conformal coating for the FC ESC VTX camera/dve board and reciever on my GepRC TinyGo 4k and iFlight Nazgul xl5. I wouldn't dunk them in water but I'm confident they can handle a puddle snow or rain.

2.09.2024

J**.

Exelente calidad

1.01.2026

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MG Chemicals - 422C-55MLCA 422C Silicone Conformal Coating 55 mL Bottle

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Description

Specifications

Reviews

Common Questions