"Duragloss 301 Tonneau cover & vinyl convertible dressing" It is detergent resistent, UV resistant sun screen formula. Its an 8 fl oz liquid from Amazon. I had luck with some vinyl wax but when the top flexed some patches lifted and could be seen. I put this on my '62 300 convertible with a white top.
Thank you! I'm gonna need something like that also for a white convertible top.