Either the timber should pull up or the fibre will break where it is held. Testing near the edge of a laminate will be tricky because it is usually a resin rich or resin poor area. Otherwise, cut one skin then "crack" the timber to leave just the other skin holding the two parts together. Then try to rip the glass off one part at 90 degrees, one part cantilevered off a bench, the other dangling off the side with increasing weight added to it. There should be an engineering standard around for an alternative test.

Peel plied resin requires a quick sand to get good adhesion with successive laminates, but not as much as non-peel plied resin.

I would personally avoid using water or other solvents to wash an area to be laminated. An air blow-down and/or a good brushing and/or a vacuuming should be enough, and doesn't take very long.

Why didn't you just resin the timber, leave for 30mins or so before getting too tacky, then apply the laminate. No sanding to bother with and a good chemical bond.