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Polyurethane

Like PVA glue polyurethane adhesives are fairly strong when dry and they are usually fairly clear when dry.

These adhesives have an advantage over most PVA glue when it comes to water resistance because when a polyurethane adhesive is dry it is water proof.

These types of glues expand a little bit when they dry so they are good for most woodwork projects or for using in woodwork joints.

Even though it expands slightly the joint must be fairly tight and clamped hard. This is a glue that is considerably more expensive than PVA glue and its shelf life is not nearly as long as a PVA glues shelf life is.

These glues are a good alternative to PVA glue but they still come up short compared to PVA glue. Even though they are strong and water proof they are still more expensive and not as versatile as a good PVA glue which is why it is probably still the best option for carpentry or cabinet making especially for a beginner.

This type of adhesives is available as a one part or two part system and not only is it strong and durable it also has excellent sealing properties so it can be used to level, seal and fill gaps and holes better than most other adhesives.  

Because these adhesives react with moisture it can be more difficult to work with especially for woodwork beginners and it is also a good idea to wear gloves when using this type of adhesive because it can react with the moisture on your skin.

This adhesive is suitable for interior and exterior use and once dry it is strong and very durable and is usually able to be painted over after drying. This type of adhesive is not only suitable for woodwork it can also be used in metalwork, construction, decking and flooring.

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