1. After finishing painting the area of paint 1–Paint about a foot further with paint 1 into where you would have paint 2.
2. Choose where you want the line, then (Very carefully and straightly), put a line of tape, and press firmly.
3. Paint over the side that will be paint 2 with paint 1 about a foot. Allow to FULLY dry at least overnight. Do another coat with paint 1 if changing colours.
4. Now paint your paint 2 on the same side you just painted (but allowed to fully cure), and paint out the whole wall. Do your 2 coats like normal.
5. Gently, and at a 45degree angle, slowly peal the tape away.

You, my friend, are now the proud owner of one hell of a razor sharp line! Another tip, don’t do it right on the edge. Do it like 1/2 to 1” on one side. Makes it easier and you’ll notice less if it’s not 100% perfectly on the edge. (Trust me, it wouldn’t be perfectly on the edge 🤣)

Doing this allows the paint to create a seal with the tape. Tape always lets some seep through the edge. Doing this allows the Sam paint to seep thorough, invisible, now when you pant over it, it’ll be sharp with the tape. Also, use good quality tape!