So I have a Quadrifoil with a few inch rip where the cloth ripped right on a seam. Being a Quadrifoil (24 sq ft, I think), it's old (you can all guess just how old), so I don't think it's worth a professional repair. I've found some information on doing repairs, but I don't know where to get supplies (little bits of ripstop, thread). Any suggestions?

I have some repair supplies here ...

Only thin not in stock at the moment is black repair tape.

Assuming you are in the United States:

• Hang Em High Fabrics
  
  
• Into The Wind
  
  
• Kitebuilder
  

ATB,
Sam

Thanks. Is there any sticky tape that has a chance of holding, or do I really need to do a sewn repair?

Tear-Aid is pretty tenacious without getting gummy or softening up and "weeping" in the sun. It should have been listed in the link Angus posted, but here's a direct link to it on CWS:
http://www.coastalwindsports.com/servlet/the-691/Tear-dsh-Ai...


However, since you originally stated it was on a seam, I would question if there was enough material on both sides of the tear for that type of a repair. Hard to tell without seeing the damage.

ATB,
Sam