I've posted about Imagon film several times. It works great for the
etching I've been doing. There are a couple of types of Imagon film
(HD, Ultra, others?) but they've all been about the same for my
purposes. It seems to change name slightly every couple of years. It
apply it with a squeege, let it dry, expose with a 300 watt halogen
Here is one of my previous posts about it.
I'd be happy to answer any questions about it.