Is there any reason I shouldn't use lightweight vinyl spackle on new drywall, to fill the screw heads? We just drywalled my daughter's basement ceiling, and she is still looking for a drywall finisher. In the meantime, I wanted to do the screw heads tomorrow, in 1 trip. I know that drywall mud is normally used, but I like the fact that the spackle dries in about 30 minutes, and I can do both coats tomorrow. Thanks.