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Do I need antifouling paint?

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  • Do I need antifouling paint?

    When I got my boat last fall, the prev. owner kept it docked, so he had antifouling paint put on it. I am going to be painting my boat because of the smurf blue color it is, and my question is.. Do I need antifouling paint? It is fiberglass and will only be in freshwater, I will be trailering it everytime so at the longest it will be in water is if I stay the night on a Island. Or can i get by with just painting the whole hull one solid color? If so what is the best way to get the antifouling paint off, just orbital sander? Thanks..


  • #2
    Re: Do I need antifouling paint?

    No you do Not need anti fouling paint for your described usage. For proper prep, sanding and cleaning with acetone should do the trick. I highly recommend Pettits undercoater primer and EasyPoxy topside paint. It is easy to apply with foam rollers and yields a high gloss quality result. Make SURE to use the Primer!!!! Even though it says topside it can and is used all the time for the hull on trailered boats. Stands up very well over time.

    Check this out.

    http://forums.iboats.com/showthread....t=1962&page=28

    Good Luck with your Project
    1961 Lonestar Flamingo - SPLASHED...Kinda!!
    Fabricating Decks, Stringers, and Transoms
    Paint Your Boat with Tractor Paint

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    • #3
      Re: Do I need antifouling paint?

      Do not sand unless it is your last resort. Bottom paint is nasty toxic stuff. That's how it works, it kills living organisms. If you sand you will need a full tyvek chem suit, full face respirator (no half face or paper, goggles won't protect your eyes from this stuff). It will take forever to sand it off. All of it must be removed before any type of barrier coat is applied. I have been there and done that on 40ft racing sailboats. You will spend 5 times more money trying to sand bottom paint than what it will cost you to chemically strip it.


      I highly recommend this product:

      http://www.*************/product.jsp?...9353&id=167849

      It is applied to the hull and covered with a special paper. After a set period you peel away the paper and the bottom paint comes off with it. It will remove everything except the gel coat, so if you are blister free and your gel coat is still in good shape you will be able to forgo applying a barrier coat where the bottom paint used to be. If you sand you will be forced to apply a barrier coat to repair the damage to the gel coat from sanding.

      The Peel Away seems expensive up front, but trust me it far far cheaper than the time and cost involved in sanding bottom paint.
      1987 Blue Fin S170 Fish & Ski
      Fiberglass questions? Click here!
      The Holy Grail of glue knowledge

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      • #4
        Re: Do I need antifouling paint?

        i went through about 20 sheets of 80 grit (5" round with an electric DA sander) to remove all the AF paint and subsequent other paints (boat had 4 layers on the bottom of the hull)

        22' boat
        1973 SeaRay SRV220 OV Project: "The Bi-Polar Express"
        http://forums.iboats.com/showthread.php?t=359619

        How i made my boat seats..
        http://forums.iboats.com/showthread.php?t=379388

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        • #5
          Re: Do I need antifouling paint?

          it seems that it may be just as easy to do new af paint? to paint the hull i can just sand and thin the old paint then do the primer and new paint right? if i was to do new af paint can i just scuff with sand paper and go over light the top paint??? Thanks P.s. I'm guessing its a no no to sand blast the paint?

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          • #6
            Re: Do I need antifouling paint?

            Originally posted by wilsontowing View Post
            it seems that it may be just as easy to do new af paint? to paint the hull i can just sand and thin the old paint then do the primer and new paint right? if i was to do new af paint can i just scuff with sand paper and go over light the top paint??? Thanks P.s. I'm guessing its a no no to sand blast the paint?
            Do you know what kind of paint is on there now? There is much more to bottom paint than just sanding and reapplying. Most bottom paints are not compatible with each other. Some, such as Pettit SR21 and Interlux VC17 are basically the same thing and can be interchanged and applied over each other with minimal prep. Others must be completely removed before applying another type.

            Here's a chart to give you an idea of what I'm talking about:

            http://www.pettitpaint.com/fileshare...ilitychart.pdf

            Another issue you will have is that you will need to use a trailerable bottom paint if you choose to reapply. Most do not tolerate trailer use.

            You could hire someone to soda blast it, but that will cost more than a DIY chemical strip. I would not walnut blast a glass hull and I would not allow an amateur to soda blast either. If you compromise the gel coat you will foster an environment for hull pox (blisters) and it will bite you in the a** later on down the road. I cannot stress enough how much you don't want to try to sand this. I have sanded far more bottom paint in my racing career than anyone should ever want to expose themselves to. Trust me, a chemical strip will save you mucho time and money.
            1987 Blue Fin S170 Fish & Ski
            Fiberglass questions? Click here!
            The Holy Grail of glue knowledge

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            • #7
              Re: Do I need antifouling paint?

              Since you're freshwater and trailering I'd go with the Interlux VC performance epoxy. Tough as nails and slick with teflon.

              Check on Interlux's site to see what the prep is to go overtop of your previous bottom paint. The VC stuff goes on more like milk so next time I'll spray it on.

              Just read the stuff for you and it look like they want the old bottom paint gone first.

              http://www.**************************...ct.do?pid=2330
              http://forums.iboats.com/showthread.php?t=319609

              http://s674.photobucket.com/albums/v...y%2018%20redo/

              sigpic

              1977 Starcraft Holiday 18 I/O

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              • #8
                Re: Do I need antifouling paint?

                Don't spray epoxy unless you have a positive pressure respirator. Atomized epoxy is extremely hazardous to your eyes and lungs. Not typically a DIY operation.
                1987 Blue Fin S170 Fish & Ski
                Fiberglass questions? Click here!
                The Holy Grail of glue knowledge

                Comment



                • #9
                  Re: Do I need antifouling paint?

                  If the paint is in ok shape, not peeling off, just scuff it up with a red 3m scuff pad. If you are going to sand make sure you use 300 or finer grit or you will see sand scratches through the paint.

                  If you use Easypoxy read the directions, you have to wait like 24 hours between coats or something like that, thats why i dint use.

                  Chad

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                  • #10
                    Re: Do I need antifouling paint?

                    Originally posted by cc190cc View Post
                    If the paint is in ok shape, not peeling off, just scuff it up with a red 3m scuff pad. If you are going to sand make sure you use 300 or finer grit or you will see sand scratches through the paint.

                    If you use Easypoxy read the directions, you have to wait like 24 hours between coats or something like that, thats why i dint use.

                    Chad
                    Applying Easypoxy over an ablative antifouling will just ensure that the Easypoxy falls off after a few outings. Both Interlux and Pettit have charts detailing what must be done before the next product is applied. If the previous coating cannot be identified, it must be removed.
                    1987 Blue Fin S170 Fish & Ski
                    Fiberglass questions? Click here!
                    The Holy Grail of glue knowledge

                    Comment



                    • #11
                      Re: Do I need antifouling paint?

                      alright, I have no idea what type of bottom paint it is, its not smooth, its like an orange, almost like orange peel on a car but you can feel it when rubbed, and the paint is in good condition the only peeling is on the striping, i just cant stand the smurf-blue.. Also can I just paint from the af paint up, the af paint goes a bout 4inch above the water line. So could I just tape off down to about an inch or so of the af paint and paint from there up? And what is some good putty to fill in some gouges? Thanks
                      Attached Files

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                      • #12
                        Re: Do I need antifouling paint?

                        Sure, you can paint the topsides whatever you want (the topsides is the area between the rub rail and the boot stripe (waterline)).
                        1987 Blue Fin S170 Fish & Ski
                        Fiberglass questions? Click here!
                        The Holy Grail of glue knowledge

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