RectorSeal EP-400 Epoxy Putty. RectorSeal Epoxy Putty is a pre-measured, high grade epoxy and hardener formulated together in one stick, making it easy to break off the amount needed for each repair. RectorSeal Epoxy Putty bonds to most surfaces and hardens in 15 to 20 minutes. It can then be sanded, painted, drilled, taped, and/or machined. It is available in two sizes: a handy 2-Ounce. (EP-200) or economical 4-Ounce. (EP-400). Certified to NSF/ANSI Standard 61, Annex G-4-Ounce (12-Piece).