Mercury's Epoxy gives you plenty of time to get the brass tubes inserted and positioned in your pen blanks. If CA sets up too quickly or you don't like it's fumes, then you need epoxy. Mercury Epoxy is available in three different set times - 5 Minute, 15 Minute, and 30 Minute. This 8 oz kit provides two 4 oz bottles, one each of resin and hardener. This epoxy is manufactured in the USA - Atlanta, GA. It has incredible shear strength and gap filling capability and is great for blanks with slightly over sized holes. Aside from making pens, this epoxy is great for many other projects. If you require an adhesive that sets quickly, has incredible strength, is waterproof, and has gap filling properties, then you need Mercury's Two-Part Epoxy.