Can TotalBoat Traditional 5:1 Fast and Slow Hardeners be blended to create a customized medium hardener? Eric Boudreau April 01, 2022 14:54 Updated Yes. TotalBoat Traditional 5:1 Fast Hardener and 5:1 Slow Hardener can be blended to create a customized medium hardener speed. Related articles Can chop strand mat be used with epoxy? What is the pot life of TotalBoat High Performance Epoxy with the medium hardener? What is the difference between using a pressure pot or a vacuum chamber when casting epoxy? Can I extend the working time for epoxy resin? Will TotalBoat High Performance Epoxy adhere to ABS plastic? Comments 0 comments Article is closed for comments.