I am pressing in a hot press some high gloss laminate onto luan plywood. We are seeing a problem with marks in the laminate. I believe they are telegraphing through the laminate from the plywood core. Does anyone have any suggestions?
(Laminate and Solid Surfacing Forum)
From contributor J:
Why laun? Why not use better plywood? I think we need some more information. It's hard to make suggestions when we don't know much about the application or the exact problem you're seeing.
We are using sanded luan and I have re-sanded some with a somewhat marked improvement, but I am still seeing the defect. I have tried several different pressures and have tried cold pressing vs. hot pressing. So far I have not found the answer. Plywood is the desired core because of the weight factor of MDF.
I do not know how much the thickness of glue spread would affect this problem. We are using a black brother glue spreader. I have 35 years of wood working back ground but only one year of pressing plastic laminate.
If you have a surface sander I’d go that route. If not, lightly go over the surface with your belt sander. Use a light grit. No matter how hard you try you'll see some imperfection. The idea is to minimize.
Comment from contributor N:
I believe you have inferior laminate. You can prove this by replicating the problem using a piece of glass instead of luan. The glue is the tell. Perfect gloss on the roll can be distorted by installer, equipment, or material. It sounds like everything is ok except the material.