Speculation
I have a Catalina 22 built in August (I think) 1981 as a 1982 model.When I removed hardware from my boat, it appears to me that Catalina used silicone as a sealant or bedding. I did not encounter problems with the gel coat separating.I think silicone is less expensive than other sealant. Also, as silicone can be clear, it can be easy to clean off excess that spills out from the edges of fittings as they are screwed down.Further, silicone will not react with certain plastics as other sealant may.For these reasons, I speculate that silicone is used on your Capri.Try to locate an area where the sealant would not have to wiped off during manufacture as may be in some hidden area below decks possibly around some bolts or screws. If you see a rubbery clear (as opposed to white) substance, I think it is a good bet it is silicone.