Sanding Plywood Bullnose Edges
I should point out that when we hand sand the plywood edge prior to sending down the UV edge coating line we receive a consistent and beautiful finish. However, this is time consuming and I would think there is a solution for achieving a better sanding job on the entire bull nosed edge when going down the shape and sand since that is what that machine is made for.
From contributor F:
Itís hard to advise when we can't see firsthand. I'm wondering if your edges are still too course if youíre starting at 180 grit though? If you start at 180 youíre going to need a lot of sanding to get a smooth edge, versus starting at say 100 or 120 grit to smooth it out first then move higher to polish it up a bit. What grits are your guys using when they hand sand the panels?
From contributor M:
You're going to have to try using a much finer belt and possibly giving it multiple passes if that's an option. Plywood edges in my experience can be sanded to a shockingly smooth texture and will even accept stain surprisingly nicely if you sand it with a random orbit sander with 220 or 320.
Since you are using a belt sander type, you may need to try 320 or even 400 since this is linear action and not orbital (self-canceling) action. Don't use anything that high of a grit on the face, but you don't need to worry about proper adhesion to the plywood edge when sanding super-smooth since it still tends to wick up the finish. I will note though that I have no experience with UV finishes. I suggest you do one with a high grit belt and test it afterward.
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