Gelcoating transom

Discussion in 'Materials' started by MassimilianoPorta, May 12, 2019.

  1. MassimilianoPorta
    Joined: Apr 2019
    Posts: 4
    Likes: 0, Points: 1
    Location: Italy

    MassimilianoPorta New Member

    Hi, I need to reapply gelcoat to the transom of my rhib.

    I can't spray it so I am limited to brush or roller, what would be the best?

    Second, as I know a lot of sanding will be involved, I want to apply many layers. How much time I need to wait between each layer?

  2. ondarvr
    Joined: Dec 2005
    Posts: 1,890
    Likes: 113, Points: 63, Legacy Rep: 506
    Location: Monroe WA

    ondarvr Senior Member

    This can depend on the size of the area. On a smaller surface, if you use good techniques, and work slowly, it is possible to brush it and get it to level a little better than you may expect. This takes time though, and on a large area can be difficult.

    Rolling leaves a great deal of texture, but you can get around it by using a squeegee (plastic bondo spreader) after it gels and squeegeeing more gel coat on the surface. This fills the low spots and adds nothing to the high spots. You may need to do this a couple of times.

    As far as timing, you can still bond to unwaxed gel coat for a couple days. Sooner is better, but the surface will stay tacky enough for the next layer to stick well. Contamination of the surface may come into play if you wait though.

    The ambient conditions will play a big roll in this. Cool, humid and in the shade, and you’ll have the longest time period. Dry, hot and in the sun, and the time frame will be reduced dramatically.

    As to how soon you can apply the next coat. Just wait until the current layer hardens to the point that you can touch it and it doesn’t easily come off on your finger.

    The exact gel coat you buy will also have an influence on how well it lays down, some places even sell gel coat designed for rolling and brushing. Its not a great deal better, but it does help.
    Last edited: May 12, 2019
  3. MassimilianoPorta
    Joined: Apr 2019
    Posts: 4
    Likes: 0, Points: 1
    Location: Italy

    MassimilianoPorta New Member

    The area is about 60 x 20 inches.
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.