Assuming it is not EPS...
Sun Cure is a quick fix for vacations but no good for long term repairs. It is very brittle and always leaks adding further frustrations in the future such as delam and yellow foam.
Repairs are fairly simple after you get the goods.
You Need-
Scissors or razor blade
Clear tape
Q-cell resin filler
resin
and fiberglass
Sand paper easier with electric sander if your careful
or you can buy a complete repair kit from a local shop
Foremost make sure your repair surface is dry. Best way is to let it sit in the sun for a while unitl water stops seeping out of the crack or damages area
Get rid of the old busted parts dont be to afraid of getting into the foam as the Q-cel acts as a foam filler.
Fill in with Q-cel and sand down a little below your plain.
Lay a small piece of 4 or 6 ounce fiberglass over the repair spot and tape down on the edges outside of the repair area
Pour small amounts of resin on the glass and smooth out even with a credit card or I.D. card or something of similar character.
Let thouroughly dry.
carefully pull off tape trying not to pull up any of the laid fiberglass.
At this point it looks like crap but no worries.
Sand down until the surface is the same as it was before.
Repairs are not hard but are time consuming.
If your planning on surfing fora while then learning repair techniques will be benificial.
Good luck
On a side note Make sure the area you do the repairs is ventilated as i get a rediculuos headache from the smell of resin.
Or just pay soeone to do it
