I've had some on for months (5-6) at a time... no problem at all.
Really?
I must admit I left some on for 5 days once and it was a git to remove in the 'same' shape/design I applied it...
I generally leave it for 2-3 days max
Originally posted by Iron Forge:
I forget which masking fluid I have used in the past but I switched to toothpaste. If you are looking for a cheap alternative to the fluid try it out. I apply it using a toothpick or any other type of tool. No need to let it dry. Then spray paint it. Wait for the paint to dry then wipe off the toothpaste. You may need to get a wet paper towel and wipe off any residue but it works well for me at least.