http://cgi.ebay.co.uk/FLEX-EPOXY-EXTRA-STRONG-GLUE-WELD-PLASTIC-MADE-in-UK_W0QQitemZ360050034807QQihZ023QQcategoryZ19168QQtcZphotoQQcmdZViewItem
Unlike a standard epoxy this has rubber in it so it is not brittle, absorbs impacts and has far greater sheer strength, so is very good on areas needng extra strength,
however all our standard epoxys (unlike 99% of the ones you can buy in the general market) contain a rubber toughener , so are far less brittle than other epoxys, the FlexEpoxy contains an extra 2 types of rubber meaning it is flexible, instead of toughened like our standard range, but i think you dont want a flexible one, just a toughened one such as our standard range of clear toughened resins
http://epoxy.dow.com/epoxy/products/prod/flex.htm
Don't know if you can get these products in the UK, but here's some awesome stuff.
None of the ones listed on that link by dow are suitable for use as is, they are components to formulate epoxy products with , they are only used as trace components with a base epoxy resin to improve its toughness
Nowdays as well as the trace resins, a flexible or toughened epoxy contains an adduct of epoxy resin and ctbn rubber, basicaly we buy ctbn rubber , mix in the right ratio with epoxy , add a combination of catylists and heat them, when the reaction has happened we end up with a different epoxy, a reactive rubber/epoxy chain of
epoxy- nitrile rubber(ctbn)- epoxy
when set its epoxy-ctbn-epoxy-epoxy-ctbn-epoxy-epoxy......
The aditives listed by dow are used to give specific properties , we use some similar additives (not from dow) to add slight flexibility, but they are only at about 2-3% of the total epoxy
the epoxy will set as a standard epoxy does, but is joined by the ctbn rubber to give high flexibility, at this point usless as an adhesive as its too soft, so it is diluted down to the correct ratio with a blend of unreacted epoxy resins to give the required hardness and flexibility
Once set the epoxy should not appear to be flexible normaly, it will just absorb impacts and have great shear strength, so not actualy flexible so refered to as toughened resins unless high levels of rubber are used
For extra strength on wood planking and things like that you should only need the standard range,
the FlexEpoxy is more for use on areas that will be geting bent such as car bumper repairs etc