Antifouling paints may not adhere well to bare GRP or epoxy primers used to protect GRP, metal or ferro cement hulls so you will need to apply a specialist primer (also known as a tie coat) such as Shield Underwater Primer in 2.5 litre tins, or Jotun Vinyguard Silvergrey in 5 litre tins. These products will adhere well to the hull and provide a good surface for the new antifouling. You will also need to apply an antifouling primer to seal over an unknown antifouling (free from fouling and loose paint) if it is not being removed.
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