Thanks !
I did not know that 3M adhesive could be handled as you describe, namely spray on a plate and then brush it on. I thought it would gum up rightaway!
Also, the 3M spray adhesive was it the green, the red or the blue one ??
https://www.amazon.com/3M-Strength-Contact-Adhesive-17-6-Ounces/dp/B0002BBV2S
https://www.amazon.com/3M-Multipurpose-Permanent-Adhesive-Cardboard/dp/B0065VCXSA
https://www.amazon.com/3M-72-Pressure-Sensitive-Adhesive/dp/B000WSIYZ8
Way too many choices !!