Four inch square ceramic tile likely will not perfectly fit your countertop depth.
Tile over formica countertops.
So you will want the uncut tile to be in the front with cut tiles in back.
Clear the surface where the old formica tile is in order to make way for the new replacement tiles.
Clear the formica tile surface.
Rough up the backsplash until the plastic is.
How to install tiles over formica.
How to put tile over a formica backsplash 1.
If using a rail style tile cutter you will want to position the ragged cut side against the wall to be later covered up with a backsplash.
As long as your existing backsplash is in good condition it s a good candidate for this.
Sand the formica using an orbital sander and coarse grained sandpaper.
I actually have and then one key thing is that you really want to scuff up the formica before you go ahead and put the tile mastic or the tile adhesive onto the formica because you need to sort of grit it up and scratch it up so that it has some area for the adhesive to really stick to it and grip into it rather than just sort of sitting on top where it could kind of crack away.
Plan your tile on the countertop.
The most cost effective solution in terms of time and money is a peel and stick product.
Wash down the formica backsplash with a grease removing cleanser and a scrub brush.
Rough the formica up.