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I have laminated ply just using wood glue (making longer legs for a cot) and you'd be hard pressed to tell it wasn't one single piece, looks and strength wise. So long as the two pieces are well clamped together and the glue well spread. If in doubt, buy more F clamps. Which applies to most projects.
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Wood adhesive forms a bond that is stronger than the wood itself when used properly. I can't find any information about the strength of a wood to wood bond for that 3m stuff but can tell you it's designed to soak in so may affect finishes you plan to use. Plus I personally like to avoid wearing a respirator when glueing as it can be stressful enough without adding being uncomfortable to the mix.
I'd use wood glue: titebond 2 at a minimum as it is water resistant when dry. It's more expensive than say bostick PVA but has a more liquid consistency so can be applied with a notched adhesive scraper or a foam gloss roller. Really though your choice of adhesive should be determined by the open time (the amount of time you have between spreading the glue and joining your workpieces) that you need; titebond 2 has a 5 minute open time titebond 3 has a 10 minute open time and the cold press veneer stuff is 15 although this is an interior only glue that offers no water resistance when dry. If you're unsure go for a longer open time although this will add to the cost.
As @stevo_com says clamping is important although in this instance I'd lay the sheets of ply flat and put some heavy stuff on them spread out as evenly as possible. Think dumbbells / bag of sand / you could even lie down it for 30 minutes if you felt like it.
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Just to add to the great advice from Bobbo. Be careful at this time of year with drying times. If you are doing this job in a cold space it might dry very slowly, there should be an indication of the temperature range on the bottle.
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I had a similar task but with two 1.85m x .65m pieces, I went for the contact adhesive because handling the pieces and getting any kind of even clamping was a little tricky. Your 100x32 cm should be fine with enough clamps for wood glue.
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stevo_com
Bobbo
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@damitamit
I want to glue two pieces of 18mm birch ply together (100x32 cm) to make a 36mm thick piece. I assumed I could just use wood glue but doing a bit of googling, people suggest spray adhesive like 3M 77.
Which glue should I use to do this?