I know that you can apply new formica over old formica after sanding, wipe off dust good, clean with alcohol, apply glue to counter and new mica. But if the edges are loose in places, do you remove old mica, sand down and reapply glue to edge of counter as well as new mica, of course. If not remove, what do?
The substrate(plywood, or particleboard) must be sound, no rot(usually around the sink). And the existing laminate must be well bonded. If it has loose spots, it can sometime be reglued with heat/pressure. Otherwise, I would recommend starting from scratch.
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