Masking tape

[super__dan]

I need to spray the sills on my mazda and so need to mask a decent straight edge that I don’t want to bleed, I’ve never had much luck with traditional masking tape so is there something better I can use. I also need to mask off bits of trim so I can give it a good polich right up to the window rubbers etc without worrying about it straining.

Any suggestions of what and where to get it from?