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WEST System Barrier Coat

WEST System

WEST System Barrier Coat

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Product Details

WEST SYSTEM 422 Barrier Coat Additive is a proprietary blend designed to improve cured epoxy's moisture-exclusion effectiveness. 422 is used as a barrier coating additive to help prevent gelcoat blistering. 422 also increases the epoxy's abrasion resistance. Cures to a light gray color. Add to mixed resin/hardener at the rate of 15 to 20% by weight-3 tablespoons per 8 fl. oz. epoxy (approximately 32 oz. per B group).

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Moisture Resistance- Apply 422 Barrier Coat as undercoats of epoxy modified for maximum moisture protection

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1 - 3 of 3 Questions

Q: null Wie lange ist West System 422 originalberpakt und trocken bei 20Grad lagerungsfähig.

3 years ago

1 Answer

A: The 422 contains aluminum and mica powder, it needs to be stored in a cool dry place, covered and kept away from water and moisture. It should be good for more than a year.

3 years ago

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Q: null Can you add a 2nd coat of West System 422 after the first coat becomes tacky ?

3 years ago

2 Answers

A: WEST 422 Barrier Coat additive is basically aluminum power or tiny flakes. Whatever your procedure is for epoxy application may be followed. WEST generally has a good tech support who is available. The epoxy application is very runny and tends to drip because it is used on the sides and bottom of the hull. If you are lucky and your timing is correct a 2nd or 3rd roller application can help minimize the drips because the epoxy has become thicker and hopefully will stay in place better. Epoxy may have some benzyl alcohol in it as a viscosity reducer which slowly evaporates making it thicker, in addition to the reaction between the resin and hardener that moves into a ""gel"" phase. Once the film dries you will need to sand to remove any runs, the gloss, and surface contamination which is a terrible job so it is superior to build up as much film thickness as possible so you can minimize sanding. The aluminum additive tends to dull sandpaper so buy plenty. Other thickeners to control the drips are not recommended as they most likely will lower the performance of the film of barrier coat so don't add any. Make sure the boat is near the water and it is hot and humid and the tiny flies are abundant and you will have a memorable day. I have fixed blisters and used the West 422 Barrier Coat on two 27' boats since 1987 and the results are spectacular, durable, and well worth the work. Will Martin President Martin Corporation Dyers and Finishers since 1838 171 North Pearl St. Bridgeton, NJ 08302

3 years ago

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Q: null I have moisture coming in from somewhere on my fly bridge. I am working on process of elimination by re caulking screws and other areas. Over the winter the water in the bridge floor froze and cracked the floor lifting this area 1/16 of an in in as few areas. I am not sure if I should cut this out and refill with epoxy and re attach the flooring on top of the new epoxy OR if i should grind around the cracked area and force epoxy under this area. I have used total fair for similar issues in the past. Would this be the correct product to use. I can send a picture if needed. Thanks Dutch

5 years ago

1 Answer

A: Finding the source of the water intrusion is key. It could be screws that were not set in caulk from day one. Check for rotted wood or discoloration at the screw locations. You could roughen and re-coat the floor with epoxy to seal micro cracks (barrier additive is not really needed there but would not hurt). Add non-skid like pumice etc. for non-skid. You might consider making some tiny holes from underneath to allow water to escape the core. Do not blindly inject epoxy into spaces; it's usually a bad idea. Steve S

5 years ago

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