Here's how I repair spots that have glass showing: I feel something was wrong if the gelocat pops off and bare fibers are showing. The gelcoat should have adhered better to the fibers. Therefore I feel putting more gelcoat into the spot is not a sound fix. I use lightly filled epoxy (nearly liquid) and fill the spot with it, filling the chip to the point just shy of over filling it. I do this with a stick or syringe. (use lacquer thinner to wipe up or smooth out the epoxy). The epoxy will wet out the fibers very well and bond well to them. You can use just about any two part epoxy kit you find in any hardware or other store. It's all good enough for this job as long as it is nearly liquid yet thick enough to stay where you want it.
Allow the epoxy to cure. Wax the area and grind the epoxy down to the point where it is just below (1/32” or so) the lowest point in the pattern. You do not need to feather out the gelcoat. The patch will stick to your new epoxy. The nice thing about this process is that you can do it or again if you don’t like the way it turned out. Just grind what you don’t like away and try again.
Most importantly: Even a less than perfect repair will look many times better than that old chip and most guests have no idea that a deck crack is nothing but cosmetic.
Allow the epoxy to cure. Wax the area and grind the epoxy down to the point where it is just below (1/32” or so) the lowest point in the pattern. You do not need to feather out the gelcoat. The patch will stick to your new epoxy. The nice thing about this process is that you can do it or again if you don’t like the way it turned out. Just grind what you don’t like away and try again.
Most importantly: Even a less than perfect repair will look many times better than that old chip and most guests have no idea that a deck crack is nothing but cosmetic.