Originally Posted by Grannyknot
I mentioned fabric thickness mostly in reference to durability.
But your statement as it pertains to water resistance isn't true.
70D nylon holds a lot more WP coating than 30D nylon.
Look at HH test results between the 2.
It depends on the coating thickness. If you put the same PU coating that is on most 70 denier nylons on a 30 d in the same thickness, the waterproofness will be the same. You are comparing a silicone coating to a PU coating and are negating different thicknesses of coating.
70 d at 2.5 after coating. 1.9 before
30d at 1.3 after coating. 1.1 before.