You cannot successfully silicone treat other fabrics that have the more traditional DWR’s on them (C6, C8, etc). Â The silicone doesn’t bond to these. Â Silicone will bond to silicone though.
I silicone treated some fabric that i thought wasn’t treated with a DWR, and when i sent it to Richard Nisley to have it tested for CFM and HH levels, it seems that the silicone blasted right off during the HH testing. Â Richard saw that the fabric had a pre-existing, high quality DWR.