Yes but statistics state it would not stick because the glue will not be able to hold the banner.
Yes, you do. Which glue depends on the substrate.
Rose Banner
Glue is best.. 40 years at the trade... I like nails & glue
Silicone.
Banner House
Nail it.
Elmer's glue will not be as effective if you dilute it.
Depends on the kind of glue. -NAME your glue, they are all different.
If you water any glue down, you simply make it weaker, with less adhesive effect.
Blue light can weaken the bonding strength of glue by breaking down the adhesive properties of the glue molecules.
No, it wouldn't work as Gorilla Glue swells. It would be better to use vinyl tile glue or spray contact cement
water is not stronger then glue because water can break a hole house down.