We drained our pool in expectation of our liner being replaced, but then the replacement was put on hold for a week. The liner now has a crack in it exposing the material underneath, not sure what it is but guessing it is vermiculite. I have covered the crack with a tarp, because I was told the vermiculite could dry up if exposed to sun. Is this true? Should I be worried? Anything else I should do? Replacement will happen this coming Wednesday.