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 its fumes, then you need epoxy. This 8 oz kit provides two 4 oz bottles, one each of resin and hardener. It has incredible shear strength and gap filling capability and is great for blanks with slightly oversized holes. Aside from making pens, this epoxy is great for many other projects. If you need an adhesive that sets quickly, has incredible strength, is waterproof, and fills small gaps, you need Mercury’s Two-Part Epoxy.