i have seen guys use them lip roller ruin door skins at the shop i have work at . i would never use one. i have put many skin on many a doors and van doors all you need is a toe dolly and a finsh hammer work the hole lip evenly and try not to bend it all down in one hit. but just keep slowly hiting it evenly till down. i would use the toe dolly as a back up on the out side of the skin i put the dolly in a thick welders glove or use a thin 3m rubber squeegee this helps with any rebound blows keep the dolly from making dent on the out side of the skin when done. i did not use any filler on the skin when i was done. with that roller you will for sure if you want to PM me i will give you my phone number .you can call me and i will tell more just to hard for me to put it all down fingers hurt to much