Remember, using a calibrated pump means that you have to push only one stroke for the resin and one stroke for the hardener. If mixing in a measuring cup you would use this ratio, but caliberated pumps will give you the right ratio when you push each pump one time. An incorrect ratio will result in the epoxy not curing. Also, increasing the amount of hardener will not result in a faster cure, but it will result in a much weaker epoxy. When reading instructions be sure to distinguish between hardener and thickener.
Epoxy manufacturers sell many types of thickening agents for various applications.
Wood flour or chopped fibers are used for making fillets and filling gaps. The amount of thickener added to the epoxy varies with the application. When coating, sealing, or saturating wood with epoxy don't add any thickening powder. When filling gaps or making a fillet, add sufficient thickener, mainly wood flour, to make a peanut butter-thick paste. It is very important to mix the epoxy and hardener thoroughly before adding thickener, then to mix again after adding it C one epoxy manufacturer estimates that 90 percent of epoxy problems are caused by improper mixing.