While West System® epoxy creates an excellent moisture barrier by itself, 422 barrier coat additive is a proprietary blend designed to improve cured epoxy's moisture exclusion effectiveness further. 422 is used as a barrier coating additive to help prevent gelcoat blistering in polyester fiberglass boats. 422 also increases the epoxy's abrasion resistance. Add to any mixed West System® 105/200 series hardener combination.
| Color | : | Light Gray |
| Compositions | : | Aluminum, Muscovite Mica |
| Flammability Rating | : | 2 |
| Form | : | Solid |
| Net Content | : | 16 oz |
| Specific Gravity | : | 2.5 to 2.7 |