Comment on What is the best way to repair the inside of my kitchen cabinet? by gonecrazytoday

The first thing to do is to fix whatever leaks you have, this can be a small leak so check thoroughly.
Cabinetry is basically box building. The floor or bottom is part of the structure that holds everything together. This is put in place by the use of dado cuts otherwise called grooves. You will need to remove the bad material completely. If you are able to remove the material in the groove then you can install nailer strips into the grooves using wood glue and screws. If you can’t remove the material in the grooves. Then place the nailers at the joint line and attach with glue and screws.
Then you can insert a plywood bottom in place and screw down on the nailers.
NOTE this sounds easy but will require some Patience cutting everything to fit drain pipe, etc.

Source: Comments for Kitchen Cabinets