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Subject: Re: Fast drying glue on masonite/hardboard

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Message Thread:

Fast drying glue on masonite/hardboard

8/20/17       
Mark B Member

We are doing a project with a bunch of dimensional tiles that we are making from laminating two layers of 1/8" hardboard between forms.

The shinny surface on the hardboard seems to slow down PVA drastically. Trying to avoid using PU or epoxy, though we are definitely considering epoxy if we can track down a tip-mixed option.

Assembly of the glue up is very fast. Two sheets, 12x30, apply adhesive, into the forms, and into the press.

We would love to find something that would be sub 30 mins. to breaking down.

Thanks

8/21/17       #2: Fast drying glue on masonite/hardbo ...
Jared

Have you considered spray contact cement, as in a canister & gun setup? I'm not a huge fan of it for most woodworking applications, but for hardboard to hardboard it might work out. Success depends on a few variables, mostly around if one side of the sandwich will be absorbing more moisture than the other, but if you could test it out it might be a quick way to cut clamp time by a ton.

8/21/17       #3: Fast drying glue on masonite/hardbo ...
Mark B Member

Thanks Jared. I'm not sure contact will work as these are dimensional tiles glued between curved forms. So the plies need to slide in the press.

We have some epoxy on the way and unfortunately I think that's going to be the only way to be sun 30 mins per press.

Still looking though.

8/21/17       #4: Fast drying glue on masonite/hardbo ...
Jared

Yep, contact cement isn't the right answer for that application. Heat is your friend if you want to decrease cycle time while using epoxy, but your sub 30 minute target will be tough to achieve. Heat is your friend: electric blankets over and under molds, tenting the mold off and putting oil filled portable radiant heaters, anything you can do to trap the heat inside will help some, but my experience is that the faster the epoxy cure time, the more flexible it is, so you might see some springback.

Another option to explore is powdered plastic resin cured with RF. The guerilla method would be to vacuum bag your parts to the mold and shoot it with a wood welder. PPR glue usually has a 5-10 minute full cure time under RF.

8/22/17       #5: Fast drying glue on masonite/hardbo ...
John

Is this a one time project or an ongoing product. If it is ongoing I would use IR heaters. Not something you buy in home depot to heat your house but industrial units like Infratech. Depending on your moulds you might was to use vacuum because it is easy to heat through.

Good luck!

8/22/17       #6: Fast drying glue on masonite/hardbo ...
Mark B Member

It is a one time project with approximately 140 of these panels.

8/23/17       #7: Fast drying glue on masonite/hardbo ...
david

Mark B,

Have you considered "scuffing up" the shiny surface? It might help to give the adhesive something to grasp.

 

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