Epoxy hardener slow West System 206 (207ml)

In case you don’t know the West System, 105 is the resin, their number one component. You also need a hardened 205(fast) or 206(slow). And there are wonderful hand pumps that go on both bottles where one pump of resin corresponds to one pump of hardener(which makes a beautiful 5:1 mix!).
After this you can use your epoxy as is or add all kinds of West System fillers. West System created a truly wonderful and convenient line of products and a large base of instructions – please check out their PDFs.

https://www.westsystem.com/wp-content/uploads/1116-User-Manual-2016.pdf