Hello! I originally posted this in kitchens a while ago, but I am reposting here...

I am considering doing a tumbled stone (travertine or marble) 2x4 kitchen backplash which will wrap into the window sill area like kitchenaddict's sill (KA, hope you don't mind me

referring to your beautiful kitchen!)

In general, do you recommend caulking any part of the sill area? Should there be caulk at any plane changes (@ sides of sill or back of sill where horizontal and vertical surfaces meet)?

On the flat horizontal surface of the sill, can I do caulk (same color as grout) instead of grout so it is easy to keep clean?

Is there a product that will seal the stone and grout at the same time?

Thank you in advance!