Step 1

Clean away any wax with Cleansol or thinners, but make sure the fibreglass is perfectly clean. Make sure the ding is thoroughly dry.  Clean the ding, trimming broken fibreglass edges with a knife, and sand the immediate area with heavy sand paper to ensure the resin will bond.  Tape around the edges to prevent resin runoff.  If the ding is on the rail, run tape across the ding conforming to the rail curve, leaving a gap to pour in resin, and make sure it is sealed to prevent resin escaping forming dribbles.

Step 2

Cut up some fibre glass to fit into the ding.  This will help secure the brittle resin and seal the repair from water entering your surfboard.  Small chopped fragments will help fill the open ding.   A could of square sections of fibreglass over the top of the ding will help seal it and provide added strength.

Step 3

Mix up enough resin to fill the ding.   Mixing resin is a tricky procedure.  If you add too much catalyst in to the mix, it will heat up and become dangerous as it may catch on fire.  Its probably a good idea to have a bucket or container of water available so you can place your resin mix in the water if it starts to heat up too much.  when the resin is in quantity or mass (ie. concentrated in a large, deep ding) it heats up a lot faster; when thin and spread out things take a little longer.  Correct mixing levels depend on the nature and size of the ding.  The air temperature can also impact the type of mix you prepare.   The colder the day, the more catalyst required.  Generally mix between two and six millilitres (2-6ml) of catalyst per 250 millilitres of resin.  Use a proper measuring cup to measure catalyst, don't guess. Mix the two together thoroughly. Make sure you are in a clean environment, away from dust.

Step 4

Pour resin into the ding making sure all the little corners are filled.  Make sure you get all the bubbles out of the ding.   Don't fill the to overflowing.

Step 5

Wet the pieces of glass in the resin bucket.  Work the resin in to the ding until the silvery strips of fibreglass vanish.   Use the fibreglass to fill the ding, again working out all the bubbles.

Step 6

Leave your completed job to harden.   Wash your hands in acetone or soapy water, acetone is better. Once the resin has just passed the gel stage (approximately 15-20 minutes after completing the job), cut excess resin away and remove the tape.  Leave overnight in an ventilated area.

Step 7

The day after applying the resin, use sand paper or a sander and sand the ding so it is flush with the surfboard's normal surface, using increasingly fine grades of sand paper.  Polish the newly prepared area with a rag and cutting compound. If you're a perfectionist, you can use an extra layer of gloss over the top to produce a nicer finish. Cut the gloss back with the fine grade wet-and-dry sand paper and buff up.

Step 1

Square off edges of the ding.  Clean away any wax.

Step 2

Either cut a piece of foam shaped to fit in to the gap or use "Q-cells in your resin mix to make a paste and provide a light weight strong filler.  If using foam, make sure it is taped into place to secure the foam while adding the resin mix. Mix and apply the required amount of resin (refer to above for quantities). Once the resin has set hard, work on the foam with Surform until it fits flush with the surfboard surface, then trim the foam so it is slightly below the level of the fibreglass of your surfboard - a slight indentation.

Step 3

Tape up the edges as above and use a couple of sheets of fibreglass to seal the area.  The follow the instructions [5], [6] & [7] as above.