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Yes you do. If you don't spray both, then don't even bother doing it all. It won't work if you spray one side only. I found out the hard way. I called my daughter and told her this **** is junk, and then she said, DAD, Read the directions, you have to spray both sides. So I did and it worked great. You spray both, let is set up for about 5 minutes, then stick it. Be careful when you do stick it, cuz once you do, it doesn't move much and allow much time, so you pretty much want to lay it where you want it and that's final. If not, peel it back off before I dries to much, then re apply the adhesive, wait the 5 minutes and try again.
You think I'll be ok laying the board onto the headliner instead of the other way? Will I be able to flip it over right away to smooth it out, like tacky enough it won't fall off when I flip it over?