Table-top delaminating - Router Forums
 
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post #1 of 6 (permalink) Old 01-17-2011, 04:52 AM Thread Starter
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Unhappy Table-top delaminating

Hi

I recently constructed a router table top out of 2 sheets of 18mm MDF, laminated together. I then used Ados spray on contact adhesive to attach thin laminate, top and bottom. Once that was dry ( a few days), I flush trimmed the laminate and then added some solid wood edging, glued on with wood glue. Once that was dry, I flush trimmed the edging to be flush with the laminate, top and bottom.

It's been very hot & humid here, and now small sections of the laminate (particularly around the edges of the table) have obviously broken contact with the MDF, and have lifted. The centre of the table (where the MP will go, once I figure out how to install the MP - see my other post!) seems fine (ie the laminate is still attached to the MDF).

Should I just proceed and install the MP, or should I attempt to remove the laminate and reattach it - or a new piece? My guess is that the laminate expanded once glued, hit the edging and was pushed up as it couldn't expand over the edge of the MDF.

Cheers,

Matthew
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post #2 of 6 (permalink) Old 01-17-2011, 04:57 AM
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Hi Matt,

i believe the spray on adhesive is not as effective as the Sellys scrape on type products.

I doubt the laminate would expand as it is not wood but plastic.

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post #3 of 6 (permalink) Old 01-17-2011, 05:18 AM Thread Starter
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Hmm - maybe just bad (perhaps it's old - will check in the morning) contact adhesive then? If it's indeed bad and has just "let go" rather than being forced to let go, my chances of removing it are better...
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post #4 of 6 (permalink) Old 01-17-2011, 05:25 PM
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Hi Matthew

Spray contact adhesive has somewhat lower bonding power than the stuff in cans or tubes, and if it counts I rate the solvent-based stuff higher than the water-based variety. It sounds like you may not have applied sufficient glue to form a good bond (and/or overcome soaking in to the MDF) or the glue itself wasn't strong enough. It may be a silly question, but did you coat both the MDF and the back of the laminate with contact adhesive? You need to coat both mating surfaces. When making commercial shop furniture and counters I tend to use a lot more glue than you would apply from a spray can; the technique is really to get an even coat without any bubbles or "bits" by using a "comb" made from an offcut of laminate (with a very fine saw) and leave both sides to dry for 20 to 30 minutes. Don't leave them apart for too long. When you attach the two pieces start at one edge and sort of roll down the laminate onto the substrate (it needs a 1/2in or so overhang to make this work) and finally add pressure with either a pressure roller or a block of wood with some felt attached (like a blackboard rubber, sort of). As the contact adhesive has already set before lamination it is possible to trim straight away.

As to your problem you may be able to re-attach the surface laminates by removing the edge lipping and gently prying open the imperfect joints between the MDF and the laminate with a spatula or very thin knife, spraying in some more adhesive, rolling the joint shut and clamping together for an hour or so using wooden blocks to protect the laminate. This may work, but often in the commercial environment I work in it's easier and much faster to delaminate the pieces (gentle heat and Evo-Stick thinners or similar), clean off the substrate with the same solvent and once it has all dried to relaminate with a new piece of laminate.
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post #5 of 6 (permalink) Old 01-17-2011, 05:31 PM Thread Starter
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Quote:
Originally Posted by Phil P View Post
Hi Matthew

It may be a silly question, but did you coat both the MDF and the back of the laminate with contact adhesive?
Hi Phil

Thanks for the detailed reply. I did coat both surfaces so am a little mystified by the failure. Probably not enough glue, me thinks.

Will try and remove it -wish me luck!

Matthew
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post #6 of 6 (permalink) Old 01-19-2011, 05:55 AM Thread Starter
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I managed to get the laminate off with a thin metal ruler poked between the MDF and underside of the laminate. It didn't put up too much of a fight! I cleaned the MDF with a contact adhesive solvent, and have re-glued with a stronger contact adhesive - it seems much better now.
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