Polyvinyl Acetate or PVA is a rubbery synthetic polymer that creates flexibility and permanent bond. This wood glue is considered to be non-toxic, water-soluble which make it an ideal glue for a wide array of projects, especially for non-structural wood-to-wood bonds. The white varieties of PVA are formulated for indoor use, while the yellow varieties are designed for outdoor use. Thus, always check for the “waterproof: on the label, if you need a water-resistant glue.
Polyurethane glue is a synthetic plastic resin that craft a tight and lasting bond. Polyurethane glues are one of the primary ingredients in many wood glues, as it is used for almost everything from paint to wood floor finishes. These wood glues excel when joining the end-to-end of the wood grain. Polyurethane is also moisture-activated, where it relies on the moisture in the air. Hence, it can bond perfectly even in humid conditions, unlike other wood glue and does not quickly dry out sensitive wood fibres.
Epoxy wood glue without a doubt is one the best wood glue for filling in cracks and gaps. Unlike the liquid texture of other wood glues, the epoxy glue can thicken to a putty-like consistency. Epoxy wood glue is a two-part formula, that consisting resin and hardener that can interact instantly at the time of application. Once cured, the durability and waterproofness of epoxy glue make it favoured by woodworking experts