the key to that great stiffness with out the flaking, is 'layers' light spray, let soak in, press, let cool re-spray, set/soak in, press, let cool, spray (ya know wash, rinse, repeat :) ) until its as stiff as you want it to be. don't saturate too heavily, a light spray is less apt to flake even if the mixture is a kind of 'heavy' mix that's ok, just spray lightly each time.