Possible Problems with Drop-In Liners
With plastic "pop-in" bed liners, water and dirt can get trapped underneath the liner, resulting in corrosion and noise while driving. Turbo Liner prevents rust and corrosion by permanently bonding to any surface, without bolts or air gaps. It also deadens sound vibration giving a quieter ride. Plastic "pop-in" liners tend to warp and even crack in extreme weather conditions or from heavy loads. Again, this simply is not an issue for Turbo Liner.

Possible Problems with Polyurethane Liners
Polyurethane liners are sprayed in many different ways, but one thing holds true about almost all of them they dry slow. What happens when spraying Polyurethane is you end up with a thicker coating in the valleys and a thin coating on the peeks of the bed. The other thing about Polyurethanes is that most of them have a really rough and chunky texture that short of looking bad the texture has no other function. Color holdout is another issue. Most companies don't use much UV protection in their materials, which causes them to chalk and fade out almost immediately.