RE: Best Firewall Sealer
I prefer epoxy but avoid trying to thin it with alcohol. Use a finishing resin (it is thin) or just simply mildly warm 30 minute or longer epoxy as you apply it. Thinning epoxy with anything will weaken the chemical bond which makes epoxies so durable, heat works much better and creates a much more durable coating. Epoxy paints work well also, for instance Klass Kote is excellent and, if you use a light color like white or yellow, makes the area inside the fuse much more visible if that is a requirement for installation of fuel lines, tanks, etc.