Trial 1 results!

Trial 1 took place over several days*. A few things had to be redone, due to alarms not going off, missing the time when it was due to be tested etc. But overall it worked out well and all the glue held more than I expected (I thought glue was pretty weak, despite the guy on Better Homes and Gardens always saying "now the nails are just there to hold it till the glue dries").

The two glues I'm testing are wood glue, designed for porous surfaces only, and Tarzan's Grip, designed for all surfaces.

Anyway, these are the results. I don't know how to do a table on Blogger.

WOOD GLUE
Porous
30 min -- 500g
60 min -- 1500g
180 min -- 1500g

Non-porous
30 min -- 125g
60 min -- 75g
180 min -- 210g

TARZAN'S GRIP
Porous
30 min -- 150g
60 min -- 300g
180 min -- 800g

Non-porous
30 min -- 0g (did not hold weight of empty bag)
60 min -- 0g (held empty bag but collapsed as I was getting the funnel into position)
180 min -- 50g

The wood glue has a tendency to snap while I'm refilling the 500mL measuring jug, which is why it has so many exact 500g increments. I think it can sometimes handle a certain amount of weight, but not for too long. This experiment could be improved if I had something that could pour continously and measure the flow, but I don't have a meter of this sort.

*I'm going to email Ms Zhang to find out whether this is bad.