I just went through this thought process. I have only done a few lamination
jobs. My last before this one was 17 years ago.
I settled on 7 ply plywood for the splash as well as the countertop because
I could not convince myself that the edges of the MDF would hold the
laminate. AND this was a job I never wanted to do or do again.
Be sure to double coat the raw sanded edges whichever you choose.
Maybe another poster with more experience will offer a better suggestion.
MDF is just fine for a countertop. Better in my opinion than plywood,
because plywood can delaminate.
Use an ample amount of contact cement on the edges starting by one coat
thinned then, when it has dried overnight, another two coats of regular
consistency contact cement.
In most cases, regular particle board is a good way to go.
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