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  1. #1

    Default How to fix a fibreglass dinghy? Help!

    I'm new to this forum, and I'm afraid I know nothing about boats, and I mean absolutely zero. Despite my lack of knowledge I've bought a fibreglass Dinghy type of boat, and quite frankly it's in a little bit of a mess. The transom wood has rotten, though the fibreglass in between is sort of in one piece, but very thin. there are a few holes around the top where the top joins the hull. I've bought some filler with fibreglass for the holes, and have wire brushed them down ready to fill. I don't want to put a wood transom back on, so was planning to use a thick perspex sandwiched together with polyeurethane foam in between to add some substance and strength to a very weak back end. Does this sound like it might work? It needs to be strong because I plan on putting a small outboard on it. I've searched the internet and this was an option that came up, but I'd like advice from people who actually know what they're doing. Thanks in advance.

    This is what I'm working with after the wood is off.
    Click image for larger version. 

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    Last edited by WhippetOutOnTheWater; 04-23-2018 at 08:10 PM. Reason: Edited to add photo

  2. #2

    Default Re: How to fix a fibreglass dinghy? Help!

    Just to add I can't use seacast. I'm in the uk and I don't think we can get it here.

  3. #3
    Join Date
    Dec 2006
    Location
    Chaumont Bay, N.y., USA
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    Default Re: How to fix a fibreglass dinghy? Help!

    Ayuh,.... I can't believe there's enough strength in foamboard to support an outboard,.....

    I'd use plywood, like it was originally,....
    Any Grease is Better,... Than No grease at All....

  4. #4
    Join Date
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    Default Re: How to fix a fibreglass dinghy? Help!

    2X on the plywood being the most cost effective, especially if it was just a stiffener sitting in the 'pocket' of the transom shown in the picture.

    If you want to eliminate the wood, the perspex isn't viable in my opinion....'polyurethane foam' is very broad; the correct versions would be suitable a cores if you want to fill the void with a laminate.....another approach would be to use an aluminum plate, stiffened as needed, as a surrogate for the wood....

  5. #5

    Default Re: How to fix a fibreglass dinghy? Help!

    Quote Originally Posted by bondo View Post
    Ayuh,.... I can't believe there's enough strength in foamboard to support an outboard,.....

    I'd use plywood, like it was originally,....
    Thanks. I wasn't planning to use just foam. It would have to have something else, ie Ply, Perspex, Aluminium etc. The plan was a piece inside, and a piece outside, bolted through, then filling the void with the same sort of foam that is used to fill the bouyancy chambers. No, I dond't expect foam alone to support an outboard.

  6. #6

    Default Re: How to fix a fibreglass dinghy? Help!

    Quote Originally Posted by makomark View Post
    2X on the plywood being the most cost effective, especially if it was just a stiffener sitting in the 'pocket' of the transom shown in the picture.

    If you want to eliminate the wood, the perspex isn't viable in my opinion....'polyurethane foam' is very broad; the correct versions would be suitable a cores if you want to fill the void with a laminate.....another approach would be to use an aluminum plate, stiffened as needed, as a surrogate for the wood....
    Thank you. What type of foam would be good to fill the void? If I must use ply I will but I do want to fill the void. I only searched the internet and the Poly foam came up. Is it the sort that is used to fill the bouyancy chambers that I need? If so what type is that?

  7. #7

    Default Re: How to fix a fibreglass dinghy? Help!

    I'm thinking of squirty foams, not foam boards, to squirt in after the wood or whatever is on and bolted.

  8. #8

    Default Re: How to fix a fibreglass dinghy? Help!

    This is the sort of thing I was looking at. https://www.cfsnet.co.uk/acatalog/me...iquidfoam.html

  9. #9
    Join Date
    Dec 2006
    Location
    Chaumont Bay, N.y., USA
    Posts
    5,880

    Default Re: How to fix a fibreglass dinghy? Help!

    Nope,.... Wrong stuff for the wrong reasons,......

    Yer transom should end up bein' plywood, 'n fiberglass,.....
    Any Grease is Better,... Than No grease at All....

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