Unfortunately, the initial selection of material is integral to the mold design.
Switching to a different plastic would require a new mold; since the shrinkage rates are entirely different.
To give you an idea, I have some data for nylon 6/6.
I'm guessing that a deck spoiler is about 40" wide??
If so, the shrinkage can be anywhere from 3/4" to 1". In other words, the mold has to be an inch longer than final dimension so it will shrink to the correct size.
Molding plastic in the US is actually very economical. Most plastic things have the molds designed here, molds made in China and then the actual part production is done here.
Eric
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