Billy...how i do vinyl is use a heat gun to heat it up and it will stretch really good....it all depends on the vinyl..some stretch good, some dont.....ofcourse crush would be easier,,but if u want the white vinyl look,,just use heat gun,but dont get too close and dont hold on there for long..or it will start to bubble up...but when u go to glue them on,,,u need some good strength glue,,or they will start too peel off.. and u need to spray both the plastic peice and the material..and let both almost dry..then as soon as it touches the plastic,,it will stay in place...
hope this helps,....maurice