Holes are a little more difficult than cracks as the repair wants to sink in and usually takes a 2 part fix.
Here is a basic $20 crack repair.
this is a bigger crack, so I am using 2 smaller scrap strips to make it more manageable. Heating the scrap with the heat gun until it becomes elastic, then heating the surface so it fuses together. You have to heat the kayak surface enough to fuse the 2 plastics, very tricky when you are dealing with thin plastic.
I have turned some little hole repairs into BIG hole repairs.
Next you are pressing it in place so that it fills in the crack.
After letting the kayak cool, I heat a screwdriver blade, you can use a soldering iron as well, but this works well for me. Once the blade is nearly red hot you do a quick swipe of the torch over a section of the repair and feather it in so there are no edges to catch. If flat enough, I use a scraping tool to make it look even better.
