Hey there --- I've used the stone-look spray paint, pretty much every variety, for a number of projects, including some that had sealed topcoats --- it will absolutely still have a texture. Which, if it were me, I wouldn't let anywhere near my counters, because OH, the nightmare of trying to keep cleanish.
No matter how careful you are with cutting boards, etc, a certain amount of food will end up on the counters --- if that food happens to be raw chicken juice you want to be able to clean it up handily.
I would do the sand, primer, roll on version, with ragging or sponging or dragging to create the desired look - then at LEAST two coats of poly.
One thought would be to get the stuff you want to use and a chunk of masonite (cheap, lumber section of Home Depot/Lowes) and test out your technique a couple times before going "live".
No matter how careful you are with cutting boards, etc, a certain amount of food will end up on the counters --- if that food happens to be raw chicken juice you want to be able to clean it up handily.
I would do the sand, primer, roll on version, with ragging or sponging or dragging to create the desired look - then at LEAST two coats of poly.
One thought would be to get the stuff you want to use and a chunk of masonite (cheap, lumber section of Home Depot/Lowes) and test out your technique a couple times before going "live".