take a scrap piece and try a fine steel wool over its surface first.
test a single coat, allow to dry for a day or longer as needed.
evaluate. steel wool, second coat, dry, evaluate. repeat until desired
don't know about laminate but that's how we do the 4 coats of
polyurethane over sanded wood floors.
You may be asking for trouble. Laminate is plastic. It is not wood, it
cannot be sanded and re-sanded after the Varathane gets worn. You may not
get a good bond to the plastic material as it is designed to be smooth,
tough, and resistant to stuff sticking to it so that makes it easy to clean.
If the laminate is in poor condition, a top coat will not improve it. If it
is dull and you want shiny, you have the adhesion issues. Laminates are
designed to eliminate the need for any coatings and the finishes on the good
stuff are far more durable than anything you will apply from a can.
If you post why she wants to do this perhaps someone can make a
recommendation, but if it is worn out, it is best replaced.
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