Epoxide resin is a commodity. They all buy it in bulk from the same
chemical company. Then they try to make theirs look different to the
consumer and advertise heavily. I doubt any will tell you what actually
makes their brand different chemically.

Generally the 1:1 is considered easier to measure and mix. I use very
small quantities and can measure equal amounts by eye down to one drop of
each to fill a couple of screw holes.

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