First, thank you for the replies. We passed along the '93 '22 to another member last year, but forgot to update the profile to reflect our '08 Venture '29 (Penguin).
The Venture '29 uses plastic with a fairly good color match to the off-white hull color. The material is used in a lid on the cockpit bench seat, the interior access cover to the bilge, and in the head cabinet.
Our boat has side air intake vents with a fiberglass insert. One piece of the insert was lost while under way. I think the best way to replace the missing piece is to make new inserts of plastic.
I have compared Seafoam Starboard to the original vent and it is a reasonable match, but not as close as the original material on the boat. I guess I'll proceed with Seafoam Star Board and see how it turns out.
Again, thanks for your comments,
Wayne