The loss of plasticizers is a natural phenomenon but can be accelerated by UV, Infrared, airborne pollutants or improper cleaners or protectors. The loss can be retarded, and the useful life of vinyl extended by application of a protector that restores the plasticizers such as Vinyl Guard. Regular use has been proven to double the life of vinyl. This applies to vinyl seats, trim and tops.
If your vinyl feels dried out or is faded and tired lookingtry washing with EZ Vinyl Cleaner. Wet the surface firs, spray on EZ Vinyl Cleaner, use a scrub brush to get into the recesses, rinse well and let dry. Then, apply 2 coats of Vinyl Guard. You should feel an immediate difference. It will be slight at first but re-cleaning and application every 2 to 3 months should increase the suppleness and flexibility. if this does not work there are no other options and you will have to replace the top.