How to Fiberglass: Fixing a Cracked Kiteboard

Step 2 Sand Down/Out the Bad Fiber Glass

The first step in fixing a crack is to sand out or down the broken fiber glass. It comes away pretty quickly if you use an abrasive pad on a power sander or angle grinder. Be careful though, you can easily take off too much material and grind into something that you didn't want to.

There is no hard and fast rule that says when you have taken out enough of the bad glass. A good rule of thumb would be to clear out a section of fiber glass a few inches around the original crack.

You'll be sanding through hard little pieces of old fiberglass and epoxy and you certainly don't want to get any of that stuff in your lungs or clothing so now is definitely the time to wear the proper safety gear.

If you are starting a new fiberglass project and not using it to fix a crack then you won't need to do this step.