brushable liquid mask?

i consider myself a decent line artist with the brush, and i would like to use a brushed medium to mask off areas i dont want to spray, then be able to remove it with water or a solution that wont damage the pain. is there a product that would make this possible?

There was a guy on a jobsite I was at who was using a roll-on mask to protect the windows. The stuff is pretty pricy, and I'm not sure if it can be sprayed.. I think it was from sherwin-williams

When I used to race R/C they had a liquid mask product. Depending on how big an area you are doing it may work for you. Check out any hobby store. They should carry it or know where to get it.
http://www.hobbypeople.net/gallery/699810.asp

Looks like there is one made by sherwin-williams
http://www.sherwin-automotive.com/products/list_products.cfm?cat=72

thanks for the responses guys i will have to check out some hobby shops on tuesday

Yeah, there's actually a few different companies making it for the R/C application.

Called "spraylat" I think.

most places call it SLIME. i wouldnt trust it, as if not put on heavy enough you can still get overspray.

It may not be what you're looking for but the product I've used is called spraylat (a liquid mask) and it worked pretty well. It was a blue latex like "paint" in a gallon can. You brush it on and when it dries you can cut it and peal out where you want to spray. Great for some types of masking. I think SLIME is something totally different. Never used it.

It's especially good for curved and irregular surfaces. Gotta' watch for tiny air bubbles and you want it to be thick enough to be pealed off as one piece but if it's too thin, it gets harder to remove all the pieces. But the thicker you put it on, the longer it takes to dry.