Is it necessary to seal artificial heads and fins before painting.
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I use a fungicidal sealer on the whole fish which includes the head and fins. The sealer helps the paint to bond too, or so I've been told.
Yep it helps with you finish. By evening the base coat.
Seal before finishing out the junction in order to get equal adhesion of the filling materials. It isn't imperative to seal an artificial head, but it will aid by giving the finishing coats a consistant primer base.