G4 Primer ?

Discussion in 'Fiberglass and Composite Boat Building' started by nevilleh, Nov 7, 2011.

  1. nevilleh
    Joined: Sep 2008
    Posts: 73
    Likes: 2, Points: 0, Legacy Rep: 53
    Location: scotland

    nevilleh Junior Member

    Anyone had much experience of G4 primer? We use it as a primer for plywood decks / bulkheads before applying GRP. Is it really worthwhile using this - Im wondering as most other people that I know just put the GRP straight on to the wood.

    Neville
     
  2. keith66
    Joined: Sep 2007
    Posts: 326
    Likes: 19, Points: 18, Legacy Rep: 168
    Location: Essex UK

    keith66 Senior Member

    G4 is a one part moisture cured polyurethane varnish often used as a sealer for cheap one shot moulds made directly from mdf or similar. Its primary use is as a pond sealer for concrete, though i have used it for one shot mould making i dont know how well it sticks if used as a primer for grp. I prefer to use epoxy & cloth if glassing decks, its lighter, stronger & sticks for keeps.
     
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