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well, if you want a really strong bumper go with polyurethane, but the thicker the layers the stronger the fiberglass. and as for the shrinkage, keep it out of cold water, j/k, anyways it all depends on whos painting it, as far as i know if your parts get a good prep job, and are painted properly, you shouldnt have any troubles at all.
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so far:
1990 accord ex
JDM F22B DOHC/Nakayama cold air intake/Nakayama exhaust/18" Enkei Zoku painted black/Yokohama Parada Spec II/Full air ride/shaved doors & mouldings/VIS R34 front bumper blah blah blah...
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