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Wood preservative is a chemical that will soak a good way into the wood surface and will have bacterial and fungicidal properties. It may also contain UV inhibitors and may be water repellent. The purpose of a wood preservative is to stop exposed wood form rotting.

A wood primer is a chemical that is applied to the surface of the wood and is intended to adhere well to the wood surface on one side and any undercoat paint applied on top. Sometimes the primer contains components designed to fill the grain of the wood so that when sanded down a smooth finish is obtained (sometimes these grain fillers are used before the primer). The purpose of a primer is to ensure that the paint coat does not peel off painted wood.

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Q: What is the difference between preservative and primer to wood?
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