I have always hated to use super glue when putting together frames with polystyrene mouldings. Well, i was searching the internet for anything other than "super glue" for gluing the four corners together. I "think" i found it and the price is very reasonable and it has a shelf life for several years. I was told this stuff is very strong... "High performance adhesive for difficult substrates. Bonds to metal, plastics, ceramics, magnets, wood, fabric, ABS, PVC, and some vinyl's." Excellent bonding adhesive for porous and non porous materials." The salesman said he is 99% positive it WILL work so I ordered some and if it DOES work i will keep you posted... ?
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(And, yes, it IS safe to use... NO dangerous chemicals and it does dry fast, very fast....)

(And, yes, it IS safe to use... NO dangerous chemicals and it does dry fast, very fast....)