Uv protection

Discussion in 'Fiberglass and Composite Boat Building' started by Josip N, Nov 12, 2018.

  1. Josip N
    Joined: Sep 2018
    Posts: 9
    Likes: 0, Points: 3
    Location: Split

    Josip N Junior Member


    How to protect clear gelcoat from UV radiation? To mix in HALS in it or some equivalent like hydroxyphenylbenzotriazole and hydroxybenzophenone

    to put some uv resistant coat when the part is done
  2. ondarvr
    Joined: Dec 2005
    Posts: 2,636
    Likes: 389, Points: 83, Legacy Rep: 506
    Location: Monroe WA

    ondarvr Senior Member

    Clear gel coat is about as UV resistant as it will ever be when you buy it, being a backyard chemist isn’t going to help much.

    You can spray a high end clear paint over it, but they tend to turn yellow and peel in a few years.
  3. pauloman
    Joined: Jun 2010
    Posts: 268
    Likes: 10, Points: 18, Legacy Rep: 151
    Location: New Hampshire

    pauloman Epoxy Vendor

    use a 2 part lpu clear gloss - note that 99% of clear coats do no contain $$$$ uv blockers - exceptions are auto clear coat and Acrylic Poly UV plus (tm)
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