Spectrum is a high quality, easy to use, translucent, spray adhesive.
We nicknamed this stuff "Gorilla Snot" because it comes out thick and it works!  It's not like that thin watery looking stuff you can buy elsewhere.

For Temporary Bonds: 
Spray one surface, allow to tack and apply material to be bonded.

For Permanent Bonds:
Spray both surfaces, allow to tack, then apply.  It's not going to come apart.

Coverage:
Single surface coverage will vary per surface and applier.  Therefore coverage is determined to be 75ft² +/- 25ft² per can.