Q:
Will your general purpose glass fibre resin stick directly to plywood without matting? I need to get a hard paintable finish.

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A:
Painting resin onto wood (without fibreglass) is not advised, mainly because it is too brittle and usually cracks as the wood expands and contracts. Also, painted in a thin film the resin struggles to cure, especially with added moisture from the wood.
Bonda G4 is superb at sealing all types of wood - one coat will seal, 2 coats will plastic coat the wood.
G4 Primer Sealers - CFS