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But the booster still like spreads evenly through the sponge? if so thanks to u and every1 who replied. im gonna boost it when it arrives and maybe post an updateit doesn't matter. doming is a side effect of boosting. if you leave it on, you get less of a dome on your rubber because that protective sheet adds to the elastic deformation resistance of the rubber, but the effect you get from the booster is purely a consequence of the booster seeping into the sponge.
believing that those PE sheets influence the outcome of treating the sponge with booster is like thinking your cold won't last as long because you bought tissue paper.
leaving the protective sheet there until you cut the rubber to size is safer, but it doesn't influence the outcome of the effect of booster applied to the sponge.