Key is to prep very well. Rough up the paint with a scuff pad and then clean with alcohol before you spray the liner.
This. And depends on the application. I used the spray on for a bumper i built for my sxs but use the roll on for truck beds. I have done two trucks. Did my 05 and it still looked good when i sold it after 13 yrs and i used the crap out of it. Did a 16 i had and it did not hold up near as well. Peddles on my mtn bike would scratch it. Not sure if they changed the formula or what but i prepped them both the same way mentioned above
FYI monstaliner is the only one that has UV protection in the mix. My understanding is the color will get chalky over time as the UV breaks down the liner. I monstalined the tub and exterior of my Sammy. All I can say is prep was a lot of work and rolling it was chore also.
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