Dye your faded top - save $$$
 

I was checking out one of the British magazines and they had an outstanding restoration of a Boxster canvas soft top.
furnitureclinic.co.uk who do leather restorations sell a kit that well make that sucker look new.

http://www.furnitureclinic.co.uk/images/911magazine.jpg

restoration kit

I used this product with great results (still holding-up after 10 months), but order two kits one is not enough.

Convertible Top Paint - ATG SMART REPAIR PROFESSIONAL

I recently used the Renovo stuff to do my soft-top. The cleaner was very effective and made the canvas look a lot better. The colour restorer worked well and then the water-proofer as well. Everything is water-based, so no nasty solvents, and is brushed on, but still needs masking up, especially the colour restorer since it dries almost immediately on paintwork. Cost was about $US80 for enough to do the whole thing at least twice or maybe three times.