I applied some "iron-on" Cedan maple veneer to some baltic birch
cabinet doors. Unfortunately, when I spayed the doors with some
water-based urethane ("Varathane") I noticed 3, 1 inch sized blisters
on the doors. What can I do to fix this? I don't suppose I can take the
iron to them again with the new urethane?
I'm thinking you might have to do just that. You may also need to
provide an escape for the air you've trapped under the veneer. A tiny
pinhole or slit (along the grain) at an edge of the pocket, and roll
out to the edge.Then sand lightlyand re-spray. HTH. Tom
I don't know if you've got an inconspicuous spot for experimenting. Tom
suggested a slit or pinhole. Make the pinhole with a 30 ga needle,
inject a little of Rockler's thin cyano (or equivalent) put a piece of
teflon over the bubble and clamp. If done with care and no visible
squeeze out, you might dodge the need for any refinishing. The Teflon
is just a precaution in case there is some squeeze out. Ideally, you
can limit the amount of glue so there is no squeeze out.
I've never tried it, but this seems like it should work. 'Borrowed' from
"Occasionally, bubbles or "blisters" will form in a veneer in an area where
there is an insufficient amount of glue in that particular spot on the
substrate. To repair a blister, drill two small holes -- each about
1/32-inch (figure F).
Use a syringe to squeeze yellow glue into the blister until it pops out of
the other pinhole (figure G). Add wax paper, a caul and clamp to add
pressure on the blister and flatten it as the glue dries. In a few hours,
the blistered veneer will be perfectly flat."
-John in NH
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