Laminated plywood

single

single

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Does anyone know of a company that will make a piece of 190cm x 85cm x15mm marine ply with formica bonded to both sides?
 
IIRC, we started in the middle and used fine lathes to keep the sides up. Slowly work your way out. We used a roller to get good compression. We then left some good weight on it until it was fully cured. It is important to use a good contact adhesive and to read the instructions carefully. Many of them require quite specific environmental conditions and also that you apply to both sides and wait until they feel tacky.
 
pmagowan said:
IIRC, we started in the middle and used fine lathes to keep the sides up. Slowly work your way out. We used a roller to get good compression. We then left some good weight on it until it was fully cured. It is important to use a good contact adhesive and to read the instructions carefully. Many of them require quite specific environmental conditions and also that you apply to both sides and wait until they feel tacky.
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or virtually dry
 
single said:
I did too, but messed it up! I'm going to try again. Its too expensive to have them made!
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It is a bit shitt or bust.

I would probably use West Epoxy. Put the whole lot down on something flat, top and bottom, and pile a load of weights onto it, leave for 48 hours.

No skill required but the laminate should have a good deal of scarification. A further advantage is that you will have West left over and it seems to have an infinite shelf life and endless other uses on a boat.
 
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doug748 said:
It is a bit shitt or bust.

I would probably use West Epoxy. Put the whole lot down on something flat, top and bottom, and pile a load of weights onto it, leave for 48 hours.

No skill required but the laminate should have a good deal of scarification. A further advantage is that you will have West left over and it seems to have an infinite pot life and endless other uses on a boat.
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Neither. I did the top with Evostik and it was perfect, but i left it four days before putting the backing on and it warped. Kitchen fitter guy said i could try wetting it and weights to flatten it, but its probably too late. I agree, its a big bend! Other thing he said it leave the wood to acclimatize for a week or so before laminating. This time i'm using Alpha Thixfix which is apparently easier.
 
Your ply warped? This shouldn't really happen. I know some people advise fixing the laminate to both sides to avoid risk of warping but ply is normally very dimensionally stable and laminate is expensive stuff. Any wood that has warped can be bent back if you are carefull. It only requires some heat and moisture and a little pressure but I would be more concerned at why it warped. Is it carp ply or is it too thin. I only laminate one side and have no warpage. If you are using it as a surface top you can normally attach it in such a way as to hold it flat anyway. You could also seal the ply.
 
pmagowan said:
Your ply warped? This shouldn't really happen. I know some people advise fixing the laminate to both sides to avoid risk of warping but ply is normally very dimensionally stable and laminate is expensive stuff. Any wood that has warped can be bent back if you are carefull. It only requires some heat and moisture and a little pressure but I would be more concerned at why it warped. Is it carp ply or is it too thin. I only laminate one side and have no warpage. If you are using it as a surface top you can normally attach it in such a way as to hold it flat anyway. You could also seal the ply.
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The rear of non fixed down laminated board will req a "balancing " laminate to do just that, balance the board to stop it "pulling" by stopping moisture changes if left exposed
 
sailorman said:
The rear of non fixed down laminated board will req a "balancing " laminate to do just that, balance the board to stop it "pulling" by stopping moisture changes if left exposed
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I understand the principle but I have never seen significant warping of ply when this is ignored. perhaps with mdf or similar but not with ply. It is normally very stable and strong enough to resist warping. A sealing coat which should be applied anyway is surely enough to prevent even minor warping. Using expensive laminate to achieve this seems like overkill to me. I suppose if it is a very thin ply board it might be a problem.
 
pmagowan said:
I understand the principle but I have never seen significant warping of ply when this is ignored. perhaps with mdf or similar but not with ply. It is normally very stable and strong enough to resist warping. A sealing coat which should be applied anyway is surely enough to prevent even minor warping. Using expensive laminate to achieve this seems like overkill to me. I suppose if it is a very thin ply board it might be a problem.
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balancing laminate is cheap as chips with no face on it, we used off cuts of normal laminate if of the correct size just to get rid of it. if its not seen it doesn't matter
 
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