Re:Masking - help please
Hiya Guenther.
Sorry I missed this. So I hope it's not to late to offer one more suggestion.
First I assume that you are talking about masking a vehicle that has a "sanded" or non slip surface. If this is what you are working with, my suggestion is to give it one or two layers of future floor wax, or similar product to seal in the sand surface. That should do a pretty good job of sealing and making the sand very solidly attatched to the vehicle. Then you should be able to mask all you want with the material of your choice without pulling any (or at least very little) of the sand off. But of course you should practice once or twice on an old junker just so you get a good feel for how it works.
But if you are talking about ground work, then the floor wax should also do a good job with that to cement it in place. Then you can paint it or what ever with a brush without any problem.
Then when you are done, just give it the flat agent of your choice.
Gary B)