I use a very light coat of spray glue and I mean light,.
maybe 1 second for the entire pattern.
if you put more, it will stick too much and be hard to take off and require sanding. its a bit of an art but once you figure it out, you wont go back.
It says right on the can how to do it so it can repotisioned. use those instructions.
If the spray on the paper looks wet at all, its way too much.