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The hardener and resin are most often a "matched pair" so you will usually not get good results when "mixing" hardener and resin from different manufacturers or even different products from the same manufacturer.
Most "matched" Epoxy systems have a Hardener-to-Resin ratio of between 1:10 and 1:3, some specialist types may have 1:2 or 1:1, but that is usually coating types or "fillers"
Some Epoxy "systems" are very forgiving in terms of the mixing ratio, and do not require great accuracy in getting the ratio correct, others are very "delicate" and require precision weighing of both Resin and Hardener.
Also you really need to be sure of the ratio, is it by weight or volume??
Correctly cured epoxy resin will be very hard (normal laminating/infusion types) and quite brittle, when not being laminated or with added "filler" Some Coating types will be a bit "tough" or very slightly flexible.
If you can not get the correct ratio from the manufacturer, you can do a controlled test, by mixing up small batches (in disposable plastic cups) and leaving them to cure at the exact same temperature/moisture and for the same time. Then test them. The proper ratio will be the one that produces the hardest, slightly brittle sample. (I would test 1:3, 1:4 and 1:5 by weight first, they are the most likely)
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