I usually use sanding sealer on red oak surfaces to seal the pores
before staining/finishing but after assembly. I have an application
that I would like to seal BEFORE assembly. Must I keep sealer off of
subsequent glue surfaces?
I don't know if you MUST but you would be better off doing so. Not hard to
do with masking tape.
Glue sort of sinks into a porous surface - like wood - and bonds those
fibers with the mating surface into which the glue also sinks. If it cant't
sink in, it is bonding on whatever is preventing the absorption.
When I am prefinishing something that is going to beglued, i extend the
finish slightly onto the surfaces that will be glued leaving most of those
areas bare; that way there is plenty of raw wood but the finish extends
slightly into the joint.
Most important information is left off, so no one will be able to answer
correctly for your specific situation.
What kind of glue?
For most wood glues, the answer would be "yes" ... leave the "sanding
sealer" (normally a shellac based product) off the glue surfaces if you
want to the glue to be effective.
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