Oh yeah, that MG stuff is way too heavy and soggy! DH bought some by mistake but I was able to use it by mixing it with the really crummy potting soil mix from the hardware store, which won't hold water at all!
The weather forecast here has improved slightly. Depending on which site I check, the low is anywhere from 32 to 36, probably more like an actual 34. Think I'll try the sheet trick anyway, tho.