Sanding out weave of fiberglass

Discussion in 'Materials' started by John Anthony Noble, Mar 2, 2019.

  1. Mr Efficiency
    Joined: Oct 2010
    Posts: 8,389
    Likes: 457, Points: 83, Legacy Rep: 702
    Location: Australia

    Mr Efficiency Senior Member

    Experimentation would be the best idea.
  2. redreuben
    Joined: Jan 2009
    Posts: 1,693
    Likes: 85, Points: 48, Legacy Rep: 349
    Location: Beaconsfield Western Australia

    redreuben redreuben

    Your first step would be to determine what the blue is. Pigment in the resin ? House paint ? I would wipe it with acetone and see what comes off, perhaps even a wipe with styrene monomer.
    If the glass is thin you will have to use a chemical etch, if its thick you may be able to sand/grind it.
    If the blue is bonded on such that it is impossible to remove then probably abrade with a wire brush or similar, wipe with thinners and apply an epoxy high build.
    Perfection is the enemy of good (enough) so you need to determine where the line is, sand it back to clean glass and lay on a resin/veil coat followed by epoxy high build and 2 pack polyurethane ?
    Or wipe it with acetone and spray it with waxed gelcoat ?

  3. JamesG123
    Joined: Mar 2015
    Posts: 655
    Likes: 75, Points: 28, Legacy Rep: 10
    Location: Columbus, GA

    JamesG123 Senior Member

    Just sand blasting it all off is probably the easiest quickest way to make sure you have a good substrate. There will be plenty of elbow grease expended fairing that mess as it is.
    redreuben and fallguy like this.
Forum posts represent the experience, opinion, and view of individual users. Boat Design Net does not necessarily endorse nor share the view of each individual post.
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Your circumstances or experience may be different.