I have a silnylon tarp shelter, bug liner & poncho that I received used, but have not tried them out in "real life" (well I have been using the poncho on trips to double as a footprint) because I didn't have trekking poles to set them up with. Until now.

I set up the tarp shelter with bug screen yesterday in the back yard, and it ended up staying out all night, with nobody inside. This morning it looks like the dew has collected on the inside surface of the tarp. Is it normal for moisture to wick through, or is it collecting on both sides of the fabric? Are you supposed to waterproof silnylon in addition to the way it comes - silicon-coated? I don't know how much use it got from previous owner, but it looks like it may well have gone unused.