Sponge & Frisket Used in Painting "Laid to Rust"

This is an image of the frisket film used in painting "Laid to Rust."  I've also included two other materials used in painting the artwork.  The object in the lower left is a natural sponge.  I used this to add texture to the dried grass area under the car.  I simply dipped the moist sponge in the grass colored paint and lightly dabbed it onto the surface.  The object in the lower right corner is a commercially made texture shield (template).  I held this up to the surface and using the airbrush sprayed paint onto the shield to produce some of the rust texture on the car.