I would backfill the holes with GRP paste, if you use filler it will almost certainly crack and shrink. If you cover the holes with some polypropylene sheet or cut a bit out from a washing-up bowl, stick it to the top surface using duct tape. Then place an impregnated sheet of Chopped strand mat over thetop (back surface). Impregnate the CSM on a piece of wood with a small gloss roller, when fully impregnated place it on the panel and give it a good rollering. On this type of repair, you get better adhesion and finish than using a brush and stippling it on.
When dry remove the poly sheet and sand first and then use a small amount of filler, Dolphin Glaze is ideal. Before painting roller (or spray) a coat of ReFace over the repair to help prevent shrinkage at a later date.
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