Not sure why you're so sure your hair isn't porous??? Everything you say about it would make one believe that it is. Some hair is naturally porous even without chemical damage or heat.
My hair is fine, thin and there is not longer a lot of it (plus it's shorter then chin length after my haircut yesterday.) Even after diffusing for ten minutes today, it took 3-4 hours to dry with two layers of not a lot of product.
3a (Corkicelli), highlighted, fine, low porosity
modified CG, since April '07
CG since 3/11/08
HGs: Curly Kinks Satin Roots, Curlycue ReNew and Coil Jam; homemade FSG and okra gel; soap bars; DM MiraCurls Curling Gelly; UFD Curly Magic; Shescentit LIs; Sevi conditioners; Botanical Spirits Puree, CJ Repair Me