Felt for Reinke Alum Shakes
If it is used for hot applications, it most likely is not a solid material, meaning that it will have space between the fibers for the hot asphalt to saturate through, not being water proof.
This being said, there were a few base sheets (Globe, for instance) that was an organic mat with asphalt saturation, that was better than 15# or 30# felt. It was essentially a 43# organic felt that worked great for mop and shingle work.
I was sad when globe went out of business because of the quality of this base sheet.
Check with the roofing material manufacturer to make sure you do not void their warranty by using "aftermarket" underlayments.
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