I use the "pro" version (3M8088) all the time, works well, sticks well, can remove easily later without destroying the moisture shield. I don't have a problem spraying it on. If worried about overspray, tape some newsprint along the outside edges or use a piece of cardboard as a blocker and set the nozzle at the narrowest setting.
It's the only product I ever use for moisture shields whether vintage or modern vehicle.
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