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Old 05-12-2009, 06:18 AM
Don Meyer's Avatar
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what happened to the contact cement

I am trying to put inserts into my 48 GMC door panels I made. I did not allow the cement to dry before putting the insert into the panel.

Here is a pic of the panel with the insert removed. The cement never dryed, but remains tacky. It did not seem to effect the vynel.

The cenent was Dap contact cement sprayed on.

After removing the insert I let the panel sit in the hot FL sun for a day....no change.

What happened?
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Old 05-12-2009, 07:07 AM
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Did you use HHR top and trim adhesive? Did you try to thin the contact adhesive? Both sides need to be glued, and both sides need to be dry before you mate the pieces together. Light coats on top of one another are better than one thick coat.
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Old 05-12-2009, 07:59 AM
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I experimented with thinning the DAP adhesive with Xylol to improve it's spray ability. My experiment came to the same result as you, the contact cement never dried.

Vince
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Old 05-12-2009, 08:07 AM
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The DAP has a long cure and often stays plyable for a long time, especially when thinned. I only use 3M contact cement and they even come in various strengths for hold.
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Old 05-12-2009, 08:14 AM
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The DAP weldwood HHR top and trim adhesive says specifically on the can not to thin it. If it won't spray correctly, you have too small a nozzle in your spray gun, or it's too cold. Optimum spraying temp. is 70 degrees. In the winter, I keep my contact adhesive right in front of a heat register.
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Old 05-12-2009, 10:57 AM
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I did not thin the cement. I spay it usually, but in thie area I am talking about I had to brush it on.

Don
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Old 05-12-2009, 12:34 PM
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The stuff does have a shelf life, how old is it?
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Old 05-13-2009, 10:38 AM
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I don't do upholstery for a living. But I've done a lot of gluing using Dap Weldwood HHR applying it with a brush. My guess is, because it happen to me once. Is you did more then one coat. Or maybe to heavy of a coat. I do one thin coat and don't brush over it works best and will make the strongest bond. Make sure you turn fans off while brushing and then turn it back on to help it dry.

Last edited by Wantabe; 05-13-2009 at 06:25 PM.
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