Top positive review
Great and versatile product
on 19 June 2017
I mainly use this when modelling (28mm/Warhammer scale) - consequently I don't use that much at a time and always end up with leftover bits which I use to make terrain pieces.
After a couple of months the grey bar starts to harden on the outside even when you're careful to wrap it as airtight as you can, but you can remove this hardened layer and use the core - it just makes it a little more difficult to get a 50-50 mix of yellow and grey.
I have also used it or a number of household repairs & filling jobs for which it is excellent. It does set rock hard and is pretty tough so can be carved/sanded/painted afterwards as required. It's not particularly sticky for bonding to things, but takes to superglue and epoxy well, so you can press it into place, shape it and allow it to harden, the remove it to allow you to glue it into place for a super strong repair.