Fineline Fluid Pen Refills

I never had much luck with masking fluid until I found the Fineline pens. They really work well, though I recommend practicing first. You mostly let gravity work rather than squeezing the bottle to get the fluid out. The wire in the cap does a good job of keeping the tiny tube free of clogs. You can easily tell when the fluid can be painted over because it becomes transparent, and I have had no trouble removing it once the paint is dry. Fantastic product if you want to do detailed masking work.