I just asked my girlfriend for you since she did our kitchen and bathrooms and she said, “Yeah, don’t do it! Get a sheet!” They do tend to slide a bit, leaving gaps which then get dirt in them. She also offers the following advice: 1) lay a chalk line in the middle of the floor first and go from there 2) even though it’s a messier job to get the non-self-adhesive kind, you can get a higher quality glue because the stuff on the self-stick ones isn’t that great 3) try to get them as absolutely close together as you can, obviously. All that said, I helped with the kitchen and it looks o.k. to me and it was easy. I used to joke that I was just going to lay a new floor rather than mop it. Never heard of a way to seal them, but maybe someone else has. Hope that helps and good luck!