bamf64 wrote:and polyester is fiberglass right? so the normal yellow tube of solarez?
No. Polyester is a type of resin just as epoxy is a type of resin. Fibreglass is as its name suggests, a sheet of woven together glass fibres.
Custom surfboards can be made in a variety of ways using a variety of techniques depending on foam type, skills of the maker and the types of resin one like to use. But in the case of your board it has been made using either polyester or epoxy resin laminated over fibreglass with a final sanding coat applied over that.
The issue is that polyester resin does not adhere particulary well to epoxy resin and vice versa, although it is possible. So you really want to get the correct stuff to repair your ding. And, this is the important one although from looking at your board it doesn't apply to you. Polyester resin will melt EPS foam so you must use epoxy resin on a board that is made from EPS.
KS