Urethane, however, is more difficult to paint. If painted incorrectly the paint may flake or peal off in patches. Urethane can also sag over time or warp due to extreme heat being left in the sun often. Fiberglass parts are generally lighter and easier to modify if any custom work is planned.
Fiberglass is also easier to repair and less difficult to paint. Fiberglass, however, is more prone to chipping from road debris, etc. Many people in the U. However, people in Japan believe that urethane is too heavy to use for aero parts and prefer light weight thin fiberglass.
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Previous Thread. Next Thread. The neat thing about the Urethane one is that it can take some beating I've busted one hitting a tire retread at speed though. One night I somehow left the car out of gear and no parking brake on. Luckily the car rolled forward into the curb in the lot and not backward into the lot and hit another car Anyway I saw it on the way to school that morning that is a clue this was a long time ago and it was bent WAY back under the car.
It recovered some initially, but but the end of the day crept back to original form. A fiber glass one would have been in shards. If a fiberglass one hadn't come on the car, I would have bought urethane as well. My glass one until I lower the car again just misses the parking barriers, but right after I put in the V8 and before I put in the spring spacers sacked springs it hit ALL of the barriers.
Has anyone considered using some of that expandable foam to help urethane parts maintain their shape? Probably not enough by itself but a ribbed metal structure like an airplane wing with the voids filled with expandable foam should do quite well.
I've got a glass spoiler on my car but it's actually turned out to be somewhat flexible the few times I've bumped it with a jack. Maybe it's urethane after all? Anyway, I've still got a Xeon urethane unit in my back room gathering dust. Brand new from MSA bought for a different car. Rear spoiler too which I'm pretty sure I won't be using. Just not sure what I want in the way of a rear spoiler for this car if anything I have noticed that the eurothane spoilers tend to warp if they are left outside in the sun a lot, my old had one and it looked like a 2x4 that had been soaked and left to dry in the sun.
You can't beat them for durability though, my only gripe is they never seem to hold paint very well even when using an elaticiser in the paint for use on plastic parts. To paint urethane parts, use a urethane paint and no primer. The Urethane paint will bond to the urethane part. I had a Z for 10 years with the air dam painted like this and it held up very well. I "rotate" the position that my spolier is sitting in from time to time in order to maske sure it doesn't warp. Until it gets put on a car I want to keep it in as good a shape as possible.
I found out real quick that leaving it standing on end was a bad idea In the product development world, many large prototypes are produced by casting a polyester resin with a filler for reinforcement, more commonly known as fiberglass. This process is popular as materials are comparatively cheap and finished parts tend to have moderate tensile strength. Often, however, fiberglass prototypes wont mechanically resemble their production counterparts.
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