Hi all. I want to try out making my own gear, but have hit a slight road block. I have gone around town looking at nylon in the various stores, but am unsure whether or not the nylon that I am looking at is regular (non-coated) ripstop or silnylon. The people at the local stores are pretty much clueless as to anything but what the fabric is made of (i.e. nylon) and what the weights of the materials. To top this all off the fabric spools are unintelligible to me.
So, my question is, how do I tell the difference between these fabrics? I want to make a tarp but don't want to get wet in the middle of the night because I used the wrong fabric. Thanks in advance for the help.