Tabbing in over old paint.

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  • 03 Jul 2017 08:22
    Reply # 4929354 on 4909002

    Well done that man. A lesser person would have given up long ago. It (and you) seems to have done a very good job!  Now onwards with the interesting stuff :-)

  • 03 Jul 2017 05:10
    Reply # 4929197 on 4909002
    Deleted user

    Well, this little guy did the trick.  It would have gone quickly, but the air compressor just couldn't keep up, so...  6 hours.  It couldn't get all the way into the corner, so I made a custom scraper out of an old hacksaw blade, and also wrapped 40 grit paper around a round profile pad and held it with needle nose vice grips.  I'm just glad it's done.




  • 02 Jul 2017 06:10
    Reply # 4928320 on 4909002
    Deleted user

    Have you tried or considered one or several of the chemical paint strippers?  Grinding or sanding in an enclosed space is my least favorite boating activity.


    Erik

  • 26 Jun 2017 17:24
    Reply # 4917836 on 4909002
    Deleted user
    I've done waaaay too much grinding fiberglass (and paint upon occasion) on Flutterby

    When there is enough space, I LOVE a 4" angle grinder with a hard rubber pad and ~36 grit sandpaper.

    That's too big for some places. The next smaller version which takes around a 2" disk is what is called a die grinder--a tool used more often for tool and die making, but still affordable.

    Where that doesn't fit, I was able to get a right-angle attachment for my dremel, and able to cut disks of 36 grit paper about an inch in diameter for it. (If you hand-cut disks like that, dress the edge by running it gently on some abrasive first so it won't have rough corners that will catch and destroy your disk first thing) Dremels are pretty cheap, and don't hold up too well in that useage, but they do work well.


  • 26 Jun 2017 15:48
    Reply # 4917680 on 4914752
    Deleted user
    Graeme Kenyon wrote:

    I was thinking of commercial grade gear which you might be able to hire. Never tried using a little home workshop type - but you might be onto something - I just looked at this youtube clip here.   

    It shows a little home workshop type and gives a few facts and figures, including a $20 attachment for a small compressor which might do the job, though might take a little longer. I would have thought it a waste of time, but evidently the trick is to shorten the hose.

    This guy is using a face shield - I think I would use a breathing mask also.

    I had the experience of owning a Hurley 20 that had been painted inside without being properly prepped.  I had to strip the entire interior and tried quite a few things.  I was really unimpressed with the small sandblaster I tried.  The things I learned were that even a small sandblaster needs a pretty large compressor (my 4 cfm compressor was inadequate).  You can make it work with a smaller compressor if you work in short bursts AND have large diameter hoses to attached to the sandblaster.  Sand and crushed glass blasting media are really aggressive on fibreglass and it was a fine line between removing the paint and removing structural material.  Walnut shell is an alternative, but I was never able to get it feed reliably in my little blaster.  The walnut is also less aggressive which means you need to work longer, which makes it even more frustrating to wait if you don't have a large compressor.  So, if you do decide to blast, it might be worth renting commercial gear.  Soda blasting might be a good choice, but I don't have an experience using it.
  • 23 Jun 2017 21:35
    Reply # 4914752 on 4909002
    Anonymous member (Administrator)

    I was thinking of commercial grade gear which you might be able to hire. Never tried using a little home workshop type - but you might be onto something - I just looked at this youtube clip here.   

    It shows a little home workshop type and gives a few facts and figures, including a $20 attachment for a small compressor which might do the job, though might take a little longer. I would have thought it a waste of time, but evidently the trick is to shorten the hose.

    This guy is using a face shield - I think I would use a breathing mask also.

    Last modified: 23 Jun 2017 21:41 | Anonymous member (Administrator)
  • 23 Jun 2017 20:17
    Reply # 4914632 on 4909002
    Deleted user

    Sandblaster!   Duh!  That could totally work.  I didn't even know that they made home shop grade sandblasters.  I'm going to have to research that one through.  I think that I could get that nozzle in there.

    Arne - I have no idea what pedigree of paints are in there.  It looks like at least one layer of Bilgekote, then some kind of primer, then a one part paint.  I do think that it's all going to have to come off, if only for me not to worry about for always.

  • 23 Jun 2017 09:36
    Reply # 4913853 on 4909002
    Anonymous member (Administrator)

    Paint?
    What sort of paint is it?. If it is two-pot polyurethane, then I would think that it could take glassing after just a bit rubbing. My experience with that sort of paint is that it is "glue with colour in it", so will not let go.

    If it is good old oil paint, then maybe you could remove it with paint remover (on a can)?

    If the paint is Topcoat (polyester), then I don't know.

    Arne

  • 22 Jun 2017 23:10
    Reply # 4913381 on 4909002
    Anonymous member (Administrator)

    Could you get the nozzle of a sand blaster in there? A decent size mobile compressor and, say, a 1/4" tip might take a little organising, and a little bit of vacuuming up afterwards - but the paint would be gone in seconds if you could get a well-directed blast.

    (By the way large discs are not made to run at the rpm of a small angle grinder and disintegration at that speed would be a bit dangerous.)

    Last modified: 22 Jun 2017 23:24 | Anonymous member (Administrator)
  • 22 Jun 2017 21:30
    Reply # 4913255 on 4912482
    Deleted user
    Scott Dufour wrote:

    Darren, is that the kind of mod you did?  I've seen shop built mods where you don't actually hold the grinder at all, but set up a jig, lock it in place, and manipulate the grinder from a safe distance at the end of a long 2x4 lever.

    If I really can't get to the paint to strip it all down, I'm going to print out a copy of Annie's last paragraph and memorialize it under the fiberglass I put over the paint.  I've already got an engraving planned for the mast partners that reads, "David said it's okay, David said it's okay."

    I've never had to take the insanity as far as a 16" disk in a 4" grinder.  I think the largest disk or wire wheel I've used is closer to 8".  If you really need to go as large as 16" then you would need to modify the grinder.  If it was just for one job I would probably get a piece of PVC whose ID is close to the body of the grinder, split it, then use hose clamps to hold it tight.  I would really need the speed control to slow down the grinder and provide a remote switch as I'm pretty sure things would go poorly otherwise.  Any way you cut it, this is a miserable job that is going to leave you covered in paint and fiberglass.  You have my sympathy, hopefully the little sander works.  If you can't get all the paint off I would attack whatever is left with acetone before applying the resin and glass.

    I too should have a plaque on my boat that commemorates David's contributions.  Perhaps, I should have a coin minted with him on it for under the mast!  Although, it could quickly get out of hand, verging on adding ballast to the boat, if I include all the JRA members that have contributed ideas.

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