Honestly, I had to ponder over this for quite a while myself when I discovered a tear in my tramp. However, i must say, it is most likely worth while to bring it to a canvas shop or something of the sort and ask them to sew it up for you. That's what I did and it cost me about $25 to have a 15inch tear sewed up. The hole started out at around 2inches, but I went out sailing with it once, and while jibing my knee went directly on top of it and i went straight through the tramp. Now granted, this was a 1979 vinyl tramp, but I was still surprised. I still have that tramp stored somewhere, but the repair job was well worth it cause it lasted almost an entire season until i save up enough to buy a new hobie stock race-legal mesh tramp.

One bit of advice when bringing the tramp to the canvas repair shop would be to bring both sides with you just in case you decide to have grommets installed in it so water can drain. Also, make sure you have the repair guy sew the tear shut, sew another piece of vinyl on the top and also sew another piece on the bottom of it as well, this will make sure that this weak spot will be super reinforced.

Hope that helped