covering ply

Discussion in 'Wooden Boat Building and Restoration' started by lorri, Sep 21, 2007.

  1. lorri
    Joined: Aug 2007
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    Location: Coochiemudlo Island QLD

    lorri Junior Member

    Hi a few more questions for you,I think there will be lots more of them.
    We have stripped all the old fiberglass off the boat as it was delaminated. Now its down to the ply,John has to patch some holes and weak spotsAfter we put new glass on then what goes over the top of it? Do you have to use gelcoat or is there something else we can use? Any advice would be great.Thanks Lorri
     
  2. kengrome
    Joined: Jul 2006
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    Location: Gulf Coast USA

    kengrome Senior Member

    Hi Lorri,

    The old glass probably delaminated because it was applied with polyresin instead of epoxy.

    Patch the holes with epoxy-based putty. Use epoxy to apply the new fiberglass. Fill the weave with epoxy-based filler. Sand it smooth and fair but do not sand into the glass. Scrub the epoxy thoroughly with TSP mixed with water. Rinse with lots of clean, clear water then let it try well. Apply 100% acrylic latex paint. Let it sit for a week or so in the sun if possible before using it.

    There are lots of other ways to do it, this is just one of them. Good luck!
     
  3. lorri
    Joined: Aug 2007
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    Location: Coochiemudlo Island QLD

    lorri Junior Member

    Thanks for that, it is more work than I thought it would be. Have been looking at it inside and out trying to work out how to do things. Am going to put the photo's I took yesterday on the photo area on here. It looks like a lot of filling inside and out where the ply has gone soft so John removed it. It is painted over the ply inside and I wondered if you have to remove all the old paint before repainting it, or just sand down the rough bits. Also have to find out what cloth/mat to use for the outside fiberglassing.there are so many things to learn.
    Thanks Lorri
     
  4. hansp77
    Joined: Mar 2006
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    Location: Melbourne Australia

    hansp77

    Soft spots... Rot.. oh well, welcome to the club.
    You gotta make sure that you cut out enough- ie beyond what is soft to make sure you get it all- sorta like cancer:p
    You may also want to invest is some penetrating epoxy, Smiths CPES, or International Evidure, or any of the others you find available, to saturate the edges of where you have cut out patches of ply... do a search here on CPES and you will find out what the stuff is.
    then in my humble opinion you wanto patch it up with new marine ply- rather than epoxy putty (if that is indeed what kengrome meant).
    Its a hell of a lot of work- it all seems easy at the start, and then you begin to pull the boat to peices, and the work multiplies... again, welcome to the club.
    There are many different glass cloths to pick from, different wheights and weaves- and I am by no means qualified enough to recomend any. Epoxy though is superior than poly resin.

    One suggestion I would have is for a while at least maybe start one good thread here where you can continue to ask questions and attract attention and advice, rather than a new thread for each issue spreading it all out.
    Also where possible, photos are really helpfull.

    As far as paint- if the paint is flakey and peeling then you have to remove it back to wood, or at least to a layer that is not flakey or peeling- if it is still strongly bonded into the wood then then you are ok to just give a light sand and paint over the top.
    You do have to know however what paint you are dealing with. Enamel (oil based) will stick to acrylic (water based) but acrylic will not stick to enamel.

    I don't know much about latex paint- though as far as I know it is not used much here in Australia. My boat has been painted it's whole life in oil based exterior house enamel- and that works just fine- benefits being, esily available, cheap, and whatever colour your heart desires. Dulux is good, as is Haymes, or really just about any of the big brands, but I prefer Dulux and Haymes.
    However, as you are going to be reglassing the whole hull again, then you have the options to choose whatever type of paint you want.
    You can go for single pack paints, such as what I use, exterior house enamel, or actual dedicated single pack yacht paint (again, an oil based enamel)-
    OR,
    you can choose to go a two pack system from the start, two pack primer, and then two pack topcoats. Two pack paints are apparantly a superior paint, but more expensive, and I suppose more work to apply.

    Anyway, good luck with it.
    I did a search on that boat, and it's a really nice design, quite similar lines to my own.

    Heres a little photo of mine, just before we put her back in last year (overdue to come out again now)
    if you wanto see more, click on my profile and look at my gallery.[​IMG]
     
  5. lorri
    Joined: Aug 2007
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    Location: Coochiemudlo Island QLD

    lorri Junior Member

    thanks

    Thanks guys for your advice,I have put some photo's in the gallery ,they are waiting approval under the name john & Lorri.as we do more I will put some in.Thanks Lorri
     
  6. lorri
    Joined: Aug 2007
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    Location: Coochiemudlo Island QLD

    lorri Junior Member

  7. hansp77
    Joined: Mar 2006
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    Location: Melbourne Australia

    hansp77

    Best of luck Lorri,
    one thing I do envy you is that you have the boat in your own backyard to work on.
    I opened my can of worms in a boatyard, expecting to be up on the hard for maybe two weeks. Thing is, with the boatyard, the fees DOUBLE every 3 weeks.
    Over three months later we finally got her back in the water.
     

  8. lorri
    Joined: Aug 2007
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    Location: Coochiemudlo Island QLD

    lorri Junior Member

    Hi

    Thanks Hans,I had a look at your photo's ,very nice.I know it's a lot of work involved but it will be worth it.I tried looking on the links for Van der Stadt but it comes up as can't find server so no good. I am just about to go outside and do a bit more on the hull,removing the last bits of old fiberglass that are still on.Under some of it we found little patches of new wood were there had been repairs made. So there will be a few more by the time we have finished.
    Seems there is a fiberglassing place not far from here were you can get your boats done or buy what you need, I will be going to see them this week to pick their brains and get supplies.Feel sorry for them all ready with the all questions I have lined up.
    You are right about there being no info on the Van der Stadts,tried looking on the web and not found hardly anything ,none on the splinters.
    The outside is the first job to do then it's the inside,all the wood was floating around when I took it out so no idea where it all goes, will be like a jigsaw puzzle trying to get it in the right places.But first we are going to glass the hull up inside,give it some extra strength, then paint over all the old paint work,yes after sanding it down.
    John works 6 days aweek so that makes it a longer job,but we will get there in the end. At least he can do some bits at work,and one of the contractors said he would get him the stainless steel cable for on the deck at trade prices,saving us some money. He can do any wiring and some that is needed and hopefully in a couple of months it will be back in the water.John bought a shell of a boat in the UK and built it all from there so it can't be that hard can it to fix her up? He had a motor sailer in Uk before that but didn't sail at all in it think he just used the motor.He had crossed from England to Belguim,Holland and Spain and got back in one piece,even thouggh he said it was had doing a 24 hour crossing it was good.Anyway talk later,
    Lorri
    Cheers Lorri
     
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