Rebedding Chainplates C&C 30
Rob, it''s not clear to me what you mean by ''rebed''. Are you merely resealing the exit areas at the deck or hull...or are you/have you pulled the plates for inspection? I''d encourage the latter given the age of your boat, assuming it has not been done in a few years, as the part of the plate most prone to corrosion will be the part hidden from any possible view.
When I recently did this, I found a variety of opinion about what bedding compound to use. In the end I chose 3M''s 5200 and dealt with its tendency to be damaged by UV by painting the chainplate/bedding intersection with several coats of one-part polyurethane. With (hopefully careful) masking, it is not noticeable or makes the bedded area look neat and nicely finished.