There are several ways to repair a water damaged area on a plastic laminate countertop where liquids have seeped through the seam and caused the particle board to swell underneath. The methods used to repair the raised spots are going to vary depending upon the style of counter top that you have. All laminate counters are not manufactured the same way; so there are various solutions to this problem. The design of your kitchen and the extent of the damage will determine the way that the repair will have to be done.
read article Water Damaged Countertop Seam
How to repair countertops
beveled edge, formica countertop replacement, how to fix, how to repair, post form, repairing, swollen particle board, water damaged

This is not beyond repair.
Cabinet ends swelling, due to water absorption, are something that I have seen in bathrooms more than kitchens. Never the less, the process of how to repair damaged cabinet sides, as a result of flooding water, is still the same. There are several approaches that can be taken but, I want to teach you the simplest one that I have discovered. You won’t need to remove the end of the structure at all. If the damage is comparable to the photo to the left, you may want to just sand & chisel down the swollen area and laminate it with a piece of Formica or thicker finished board. Read more…
Repairing Water Damaged Cabinets
bathroom, fixed, fixing, formica, how to fix, how to repair, how to repair water damaged cabinet sides, kitchen, repairing, swollen particle board, wood