Here's a good link for DIY skins
. BTW, you don't have to use noseeum for them, but the idea was to let them dry a bit, if I remember correctly.
FWIW, I've had difficulty in the past stuffing a large tarp into a bag when the temps were below freezing. Talk about having cold hands... it was painful. I ended up making one long snake skin tube for my large tarp. Much better.