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How long to clamp veneer to mdf with fsv glue?8/31
Im a bit confused here (doesnt take much to do that :) ) Im new to the veneer game so bare with me. Im gluing 10mil paper backed veneer to a 3/4" mdf substrate using that pink FSV glue. Im using cauls every 6" with my veneer and substrate sandwiched between 2 pieces of mdf the same size. Here are my questions:
- How long should they stay under the clamping pressure? I was thinking about an hour?
- If i release them from the clamps after an hour or so, do they then get stacked with weight on top of them ? if so for how long? Isnt there a period when you are supposed to just lay the panels flat with no weight or anything on them so air can pass freely over/around them so the glue can cure for 24 hours?
- Or do i just leave everything under clamped pressure overnight? But that would mean making hundreds of cauls to get anything done in time!
I am really not familiar with the adhesive you are using, but with the TB cold press veneer glue we can take our parts out after an hour. Whenever possible we like to leave them overnight to cure more before trimming or anything else though. I notice in some of your other posts you are considering a vaccum bag - definitely a good choice. However, if we are bagging something we like to leave it for about 90 minutes, it seems the glue dries a little slower in the bag.
Thanks Beau D,(cool name by the way),
Since that post,,, i have done about 12 of the doors, veneered both sides and am starting the edgebanding. We used 3/4" mdf platens with the substrate/veneer sandwiched between and clamped with 1.5" x 2.5" spruce cauls every 6" apart ,,,clamped using 3/8" threaded rods/nuts/washers. Left under pressure for about 3 hours, then deadstacked for about 4 hours, then stacked with sticks between to allow for airflow / curing for 24 hours. After this,,, doors are extremely flat and stuck like a fly to ,,, well you know the rest. This is my first time veneering at this scale,,, and this caul/clamp ordeal is HARD WORK!!! So yeah im saving up for the vacuum!!! Now on to veneering the edges,,, how do you do your edges when you are using 10mil p.b.v?
We have an edgebander so we cut strips about 4mm wider than the net thickness of the substare + veneer and then run then through the bander. I am asuming you don't have an edgebander though, so the alternative strategy we have used is brushing on glue and then clamping to the edge with a caul.
An hour under pressure should be fine. After that put them on a rack so they are can circulate around the panel as this type of glue is an evaporative cure. Most PVA's will reach there best bond strength after 24 hours. Then it is OK to do further machining to the panel without worries.