Ok  ,

Pleasantly surprised .

The Contenders :

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The Testing Setup  :

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One and two mm styrene with holes drilled to load the glue joint in either tension or shear .

42 hours cure time @ 78 F  , so definitely fully set .

The Testing Apparatuses  :

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I clamped the sheet styrene to a workbench for the tension test and clamped it vertical in a vise for the shear test .

Unfortunately , one of the Elmers samples popped off as soon as I clamped the sheet down on both sides .

It flexed it just enough evidently  .

It was the smaller disc pictured above .

So no data  , but we'll give Elmers a fail anyways .

The following are the values for force in grams .

Every sample failed instantly at the noted value .

I don't note the thickness of the styrene or the joint length but each test utilizes identical joint parameters for each .

Tension Test :

1) Elmers  - 950 grams  , Canopy Glue - 5000 grams    , Formula 560 = 5.55 times stronger

2) Elmers  - 650 grams  , Canopy Glue - 2000 grams    , Formula 560 = 3.07 times stronger

3) Elmers  - Pop loose   , Canopy Glue - 1250 grams  

Shear Test :

1) Elmers - 1700 grams , Canopy Glue - 2750 grams    , Formula 560 = 1.62 times stronger

2) Elmers - 650 grams   , Canopy Glue - 2750 grams    , Formula 560 = 4.23 times stronger

3) Elmers - 800 grams   , Canopy Glue - 2500 grams    , Formula 560 = 3.12 times stronger