Plain ole caulk will work also, if you use caulk to seal the back splash a trick I use is when immediately after applying the caulk while it is still very wet, use a good sharp square edged putty knife and and run along the seam, it will remove all the excess putty and look like it grew there. If you had a putty knife with one edge rounded it will leave a little more caulk but still look good. JMHO
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