Or a space heater. When foiling blobs, lightly grind the blob. Make sure to really wash the blob good before foiling. Make sure you take your time so the foil doesn't rip. When foiling a real lumpy glass like drapery, ripple, antique, etc. try to use a wider foil when possible.
Ripple glass takes forever to foil.
This is because of all the indents you have to push the foil into. When you have to rub down this kind of glass, start with the edges, then do the surface of the glass. When you rub normal glass, always start with the surface. To rub down the foil, you'll need to use a stick of some sort. A pencil would be a good choice but the graphite tends to get in the way.