I've read the sticky about fiberglass vs polyurethane and was wondering if "sagging" is a big problem with polyurethane kits? In this hot summer heat, I can literally see plastic piece deform in front of my eyes if left too long under the sun. Is this a problem with polyurethane since it's pretty much the same material as plastic. How will this affect the paint?

Since most if not all manufacturers choose this material for their bumpers, is it safe to assume that the sagging isn't a major issue?

 

my poly nismo held up like a champ.

 

my poly kuruma z bumper is holding up great as well.. I live in Florida and we basically have sun all year long..

 

I have a KurumaZ bumper currently on my car (my daily driver bumper) and I live in Glendale AZ... I have had this bumper now about 1.5 years and it is still in GREAT shape with NO warping at all...

Ok now remember I live in AZ and it was something like 115 today (thank god for the cooling trend)

No problems in this heat with Poly as of yet.

 

my poly kuruma z is holdin up alright so far. it was 95 today in dallas.

 

my TS holds up just fine..

 

definitly doesnt sag, and there strong as all hell. you can literally twist them up, and no cracks, bends or anything love poly