- Type 1 waterproof PVA glue, such as that used in Titebond III, contains water in the formula, but resists water erosion and separation, making it a good choice for exterior applications. Type 1 waterproof PVA glue contains polymer strands that become entangled in a bonding process. Type 1 PVA glue functions best when used on outside or exterior wood trim and wood fasteners, as well as mailboxes, birdhouses, plastic pools and outdoor furniture. It completely repels and resists water damage.
- Type II water-resistant PVA glue, such as that used in Titebond II, also contains water in the formula and resists some water erosion and separation. Type II PVA glue has a similar polymer formula as the type 1, however, it does not have the complete waterproof capability as Type 1. The formula in Type II glue has medium water-repellent qualities that fall between non-waterproof and full-waterproof. Type II PVA glue also functions well on exterior wood trim and joints, provided it doe not come in prolonged contact with water, at which point it could eventually break down.
- Type III PVA glue has no water-resistant qualities. One of the best-known type III PVA glues comes from Elmer's. The formula contains nearly 50 percent water, making cleanup easy. Glued surfaces have to be clamped until they achieve 15 percent to 20 percent of their bonding strength. A secure bond usually take about one hour, and for a complete cure at least 24 hours must elapse for full-strength adhesion. Type III PVA glues function best on lighter household materials, such as cardboard, light, thin wood panels, paper, book binding, some cloths and light ceramics. They bond most efficiently to porous materials.
- PVA glues come in a variety of colors, and usually hold the shade of their original color after they have set. The Elmer's variety glue has a pure white appearance, as do other inexpensive classroom and project glues. Some glues have a honey or cream-colored texture, such as the Titebond II brand. Elmer's woodworking glue appears yellow. Titebond III PVA glue appears tan before and after set. Generally, the darker color indicates its preference for use in exterior environments.
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