Anyone using Arches 90lb hot press for iron processes? I've been using the 140 and love it but something a little thinner would be perfect. How does the surface and wet strength compare to the heavier paper? I'm also curious about the acid pre-bath, if I should weaken the solution or shorten the time because of the thinner stock. I've been using a 5% citric acid solution for 5 minutes. Thanks for any tips.