The following is a link to a boston whaler website called contnuouswave. This particular link is to an article about fiberglass repair, but the forum has a repair/modification section that has the answers to any question you may have regarding fiberglass or any marine related repair or restoration. http://continuouswave.com/whaler/reference/whalerRepair.html It is really a good website with a ton of great pictures of boats being restored by people just like you. If you have an old hobie that you are about to start a restoration project on or if you just have some dings you want to fix, go to the repair/modification section in the forums and get all the postings for the last year or so. Grab a six pack and prepare to read all night. Have fun. -Matt