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Painting over gel coat

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  • Painting over gel coat

    I guess the title says it all. Any tips, tricks, pros, cons on painting over gel coat? Is it a good idea? Disaster waiting to happen?

    Thanks


  • #2
    Re: Painting over gel coat

    Nope,..........

    Just like Painting a Car,......... Corvette if you will........

    I prefer 2pt. Ureathanes..........

    It's All in the Preparation...........
    Any Grease is Better,..... Than No Grease at All.......

    Comment



    • #3
      Re: Painting over gel coat

      Originally posted by bond-o
      Nope,..........

      Just like Painting a Car,......... Corvette if you will........

      I prefer 2pt. Ureathanes..........

      It's All in the Preparation...........
      As stated above with one exception. Gel coat is as soft as balsa wood and using any mechanical sander should be used with a lot of care. .. Think of like this, your polishing a glass mirror to perfection thats smooth as glass and you will be pleased.

      80 grit cuts the surface quite well and you ready to paint.
      Stickly a opinion your milage may vary.

      Speed is how fast you hit the wall
      Torque is how far you move the wall"

      Comment



      • #4
        Re: Painting over gel coat

        Also remember that you have to remove all the wax - once before sanding & once after sanding. Use a good wax remover like DuPont Prep-Sol. Leave any wax on there & the topcoat will probably be the disaster you're talking about.
        ...cannot be programmed, categorized or easily referenced

        Comment



        • #5
          Re: Painting over gel coat

          Isn't it also true that most of the time you don't need to use primer? If you get a good rough sand job on the gelcoat, and get all the wax off, the color coat will stick to it nicely. Is that true, or do you need to prime also?

          TG

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          • #6
            Re: Painting over gel coat

            Originally posted by stevieray
            Also remember that you have to remove all the wax - once before sanding & once after sanding. Use a good wax remover like DuPont Prep-Sol. Leave any wax on there & the topcoat will probably be the disaster you're talking about.
            Agreed cleaned first the sanded then primed and yes priming is ness.
            Stickly a opinion your milage may vary.

            Speed is how fast you hit the wall
            Torque is how far you move the wall"

            Comment



            • #7
              Re: Painting over gel coat

              Agree on all the above advice.....except

              Gelcoat soft???

              You need a grinder to get thru gelcoat and down to glass. You would be there forever if you tried using sander.

              Gelcoat is used because it is a hard, durable surface.

              Comment



              • #8
                Re: Painting over gel coat

                Primer is the adhesion for any paint....period
                After you get it all sanded down, wipe the whole surface before priming with MEK.

                Comment



                • #9
                  Re: Painting over gel coat

                  Originally posted by andy6374
                  Gelcoat is used because it is a hard, durable surface.
                  ...and thats why I used gelcoat and not the paint.

                  Comment



                  • #10
                    Re: Painting over gel coat

                    Emerger, Sand the gel coat with gradually finer sandpaper until you get to 400 grit wet paper. You will not get a fine finish with courser sandpaper. The wax will be gone by this time, but wipe the hull with acetone to remove any moisture or oil. Mask the parts you want to not paint. Properly prime and use a two part polyurethane suitable for below the waterline (Awlgrip), or if you plan to trailer, you can use a one part polyurethane (Brightside or any of the other gadzillion brands). Use a light color for hulls with imperfections.

                    Comment



                    • #11
                      Re: Painting over gel coat

                      Originally posted by Chris1956
                      Emerger, Sand the gel coat with gradually finer sandpaper until you get to 400 grit wet paper. You will not get a fine finish with courser sandpaper. The wax will be gone by this time, but wipe the hull with acetone to remove any moisture or oil. Mask the parts you want to not paint. Properly prime and use a two part polyurethane suitable for below the waterline (Awlgrip), or if you plan to trailer, you can use a one part polyurethane (Brightside or any of the other gadzillion brands). Use a light color for hulls with imperfections.
                      Yikes are you sure of that 400 grit stuff for roughing up the gel? I used interlux prescribed method to surface prep using Prekote: BARE FIBERGLASS: Wipe a small area with a clean rag that has been wetted with Fiberglass Solvent Wash 202. While the surface is still wet, wipe with a clean, dry rag. Continue this process until the entire surface has been cleaned. Sand with 80 grade (grit) paper. Wipe with Fiberglass Solvent Wash 202. Repair surface defects with Interfill Epoxy Filler. Sand surface, wipe clean.

                      Now after the inital coat of primer yep then comes the 220 and that will take the primer to a almost irredesent glow. (glass like)

                      Hmm want a tip use a dark primer if your going to a light ext color and vise versa if you going to a dark ext.

                      Stickly a opinion your milage may vary.

                      Speed is how fast you hit the wall
                      Torque is how far you move the wall"

                      Comment



                      • #12
                        Re: Painting over gel coat

                        I know this may sound wrong to some, but primer is not that important for a good bond on gel coat, gel coat is a very good substrate for paint when using a 2 part PU. On most automotive and truck parts no primer is used over the gel coat, it's de-waxed sanded and then sprayed. If the gel coat is in bad shape, with small nicks and imperfections, then primer will fill them and make it easier to do a good job, or if you need to fill an area, primer is needed so you don't see the filler when the paint cures. I used 2 part PUs for 20+ years painting Swimming pools, hot tubs, boats and many other things and I had ZERO bonding issues going straight over the gel coat (no primer).

                        Comment



                        • #13
                          Re: Painting over gel coat

                          I see say's the blind man, So in roughing up the gel do you use a heavy grit, medium or light?
                          Stickly a opinion your milage may vary.

                          Speed is how fast you hit the wall
                          Torque is how far you move the wall"

                          Comment



                          • #14
                            Re: Painting over gel coat

                            Depending on the paint and quality of the sand paper 180 will normally work, but I do go finer if I need to. The coarser the paper, the better the bond.

                            Comment



                            • #15
                              Re: Painting over gel coat

                              Well, if you have to use primer, how do you clear coat over gelcoat? Is clearcoat different than regular paint? I have a project where I'd like to clearcoat over the existing metalflake...

                              TG

                              Comment


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