One, you have two different counter tops--it will be hard to decide which one for a back splash. Two, I have a formica back splash that matches my counters--I still have to clean it. My great aunt would tack up wax paper to protect the wall, I probably would not recommend that due to fire hazard. I might try a polyurethane to that area of the wall that I want more protection without damage to the paint. Good luck!