{"product_id":"west-system-422-barrier-coat-additive","title":"West System 422 Barrier Coat Additive","description":"\u003cp\u003eWest System 422 Barrier Coat Additive is a blend you stir into mixed 105 epoxy to push its moisture exclusion further. Epoxy is already a good water barrier; 422 is for barrier coats on polyester fiberglass hulls, where the job is keeping water out of the laminate and helping prevent gelcoat blisters. It also makes the coat more abrasion resistant.\u003c\/p\u003e\u003ch3\u003eHow much to add\u003c\/h3\u003e\u003cp\u003eAdd 15 to 20% by volume, about 3 tablespoons per 8 fl oz of mixed epoxy. One 16 oz can modifies about half a gallon of mixed epoxy, so plan one can for every half gallon of barrier coat you will roll. It cures light gray. For coat counts and when to put bottom paint on, see our guide to an \u003ca href=\"\/blogs\/composites\/epoxy-barrier-coat-below-the-waterline-coats-windows-bottom-paint\"\u003eepoxy barrier coat below the waterline\u003c\/a\u003e.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eProprietary aluminum and mica blend, dry powder\u003c\/li\u003e\n\u003cli\u003e422-16: 16 oz (453 g) can\u003c\/li\u003e\n\u003cli\u003eCures light gray\u003c\/li\u003e\n\u003cli\u003eImproves moisture exclusion and abrasion resistance\u003c\/li\u003e\n\u003cli\u003eFor West System 105 resin with any 200-series hardener\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eWest lists it for fiberglass repairs, gelcoat blister repairs, boat restoration and rudder restoration. For a harder coat with limited UV protection, see \u003ca href=\"\/products\/west-system-420-aluminum-powder\"\u003e420 Aluminum Powder\u003c\/a\u003e.\u003c\/p\u003e","brand":"West System","offers":[{"title":"Default Title","offer_id":67756310102318,"sku":"SWES-422-16","price":60.09,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0840\/4071\/2494\/files\/bs-ws4-422-422-16.jpg?v=1792275991","url":"https:\/\/boatsuppliers.com\/products\/west-system-422-barrier-coat-additive","provider":"Boat Suppliers","version":"1.0","type":"link"}