Jim ~ All of the advice that has been given so far is 100% correct, The Parma Fasmask is the cats arse, If you don't want to wait to the liquid mask to dry you could always use a spray stencil (just like the window mask material)
http://www.mdpsupplies.co.uk/stencil...m&parentcat=57
If you have any other questions please feel free to ask, I think we can all give you some good friendly advice