Trying to paint the line on unsealed chips would cause massive bleeding. Seal the chips, then tape off, then use a formica roller, it'll flatten your tape tight. Dont go thick, roll tight. Wait till it tacks up and roll on tight again. Once well covered, wait till it tacks up, then pull tape. You should have a crisp line.
Here is a sample of painted;
With chips, same thing, tape off, formica roll it, roll on clear epoxy, sprinkle chips, then once tacked up, pull tape. In this option I have found that the 1/8 and 1/16 inch chips work and look better than larger chips. Larger chips usually leave a jagged line or not as crisp as small chips.
Here is the chipped stripe;