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Old 08 June 2009, 14:46   #11
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Going back to this.
The box I need to make is now bigger. I've read that only epoxy resin will stick to wood but paint wont adhere to epoxy fibreglass? I know when I used some epoxy filler and flowcoated over the top, the flowcoat didn't stick. If I coat the Ply in G4 like has been mentioned above could I then use a polyester resin? And will it bond to byaxial glass tape and vice~versa?
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Old 09 June 2009, 17:50   #12
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Don't know if weight's an issue, but marine + glass might be heavy. but it also think that, despite what you might think at the outset, making a glass box from a 'contiboard' mould would likely work out much easier in the long run.

I recently built a three person seat box out of 12mm ply (18mm base) to provide boss & kids with somewhere to rest their bums. It works well, and it's swappable with a bottle rack for when the boat is being put to family use. but it weights a ton (metaphorically speaking!) and it's realistically a two person lift. It was also really time consuming to cut the CSM and sheath the wood totally.

bottom line though, in hindsight I reckon it would have been much, much easier and better to make a moulded box from the outset. I reckon I'll do that for next season.
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Old 09 June 2009, 18:19   #13
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Why not use foam sheets, nice and light and stong when glassed over.

http://www.ecfibreglasssupplies.co.u...ets-p-397.html

I made a bulkhead in my console with some and its solid.

How big does this box need to be and how much tape do you need? PM me telling me what you need...
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Old 10 June 2009, 02:59   #14
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Quote:
Originally Posted by JSP View Post
I've read that only epoxy resin will stick to wood but paint wont adhere to epoxy fibreglass?
I am not sure about either of those. The Mirror sailing dinghy (amongst many others) consists of ply panels glued together with glass tape and polyester resin. Likewise, sealing a boat hull / deck with epoxy resin before overcoating with paint or varnish is very common. My old composite (wood deck, transom and bulkhead, GRP hull) Fireball dinghy has a mix of two pack polyurethane paint, two pack polyurethane varnish and single pack non slip deck paint over West Systems epoxy with no problems.

Cheers

Chris
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Old 11 June 2009, 05:23   #15
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Having problems with my internet connection. Been trying to reply to this for ages

Donmac, that's good point. This box is to go over a fuel tank and I don't want to add loads more weight. I'm going to have to learnt to make a mould aren't I?
Chewy, the foam looks a grand idea! Will Pm you now mate.

Chris, I did wonder as I know Epoxy is the stuff of choice. Goes to show you can't believe everything you read on the net On the same webpage as that info it said you can use epoxy first on the wood and as it's still tacky apply a layer of poly and the two will bond?
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Old 11 June 2009, 08:00   #16
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What sort of size are you looking at for the box. Have you not thought of using a jockey seat and cut it to fit...
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Old 11 June 2009, 08:06   #17
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What sort of size are you looking at for the box. Have you not thought of using a jockey seat and cut it to fit...
That was my first thought as I'm after a lean post instead of the 1.5 man jockey seat I've got. But the tanks 40cm wide so no chance.

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Old 11 June 2009, 13:16   #18
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On the same webpage as that info it said you can use epoxy first on the wood and as it's still tacky apply a layer of poly and the two will bond?
That's the first time I have heard that, though that said I am no expert.

I would suspect it would mess up either the chemical reaction in the epoxy or the polyester, or both - not a good idea.

Do you have a web link?

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Old 11 June 2009, 13:21   #19
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That's the first time I have heard that, though that said I am no expert.

I would suspect it would mess up either the chemical reaction in the epoxy or the polyester, or both - not a good idea.

Do you have a web link?

Cheers

Chris
I'll have a look for it later Chris. It came up on a google search about fibreglassing. Had to sieve through the boy racer boom box making to find it. Will post it here as soon as I do
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