Sometimes I wonder,
Why dont people who boost just dip the rubber and sponge to a bucketful of oil, kinda like blanching or deep frying without heat.
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The oil causes the sponge to expand. It would also cause the topsheet to expand. But it also causes the glue to have less grab and be more gooey. It is a solvent that causes the glues used for the rubber to be less sticky until they re-dry. So if you did that, you would cause the topsheet to separate from the sponge.
Even without that kind of method for boosting, if you use too much booster, you can cause your topsheet to bubble up because of the pips separating from the sponge.
Usually more flammable substances cause more boost effect. Like paraffin or Ronson's lighter fluid cause the sponge to expand more than baby oil. But when those evaporate the boost effect is gone and the sponge shrinks back to its original size.
Baby oil or any other oils don't really evaporate. Over time the oil dries up. But the oil sinks into the sponge and expands it. And then the sponge actually does not shrink back.
But any of the chemicals used for boosting are solvents that cause the glue that you use to put the rubber on the blade and the glue they use to bond the topsheet and sponge, to dissolve and get more gooey.
But, if you used booster to cause the topsheet to expand, and the sponge to expand, you would not get the same effect as you do when you expand the sponge and thereby put tension on the topsheet as it is stretched.