Hey Chris,
Al's (Mineral Grey) proposal is actually very good, for a guy without a convertible

. It can be used as the top in question is vinyl. There are kits out there purposefully made to seal the convertible vinyl tops (Raggtop convertible top kits are made either vinyl or cloth), but a good vinyl protector like the one above may be used. As a matter of fact, the 303 Aerospace Protectant shown here is probably seen as one of the best in the industry.
https://carzilla.ca/collections/brand-303-products-canada/products/303-aerospace-proctant-16oz
(note you can buy in multiple sizes on there)
Word of advise: When comes the time to replace your convertible top,
DO NOT fall for the aftermarket fabric tops. They look good but stick with vinyl for the replacement. Our car's top frame does not like the ''upgrade'' to a fabric top (they tend to be thicker & don't play well with the frame).