Bushcraft

I've made my first attempt at oilcloth. Used linseed oil (boiled I think but I no longer have the container), turpentine in equal parts, and iron oxide (quarter part). Looks beautiful, but...

First problem is it just won't dry. Been hanging under cover in a well-ventilated area for a few weeks and it's still very tacky. I'm guessing I just need to leave it longer.

More of an issue though is the iron oxide leaves residue whenever it's touched. Any ideas on how to get rid of the excess? Google does not appear to be my friend today.

Any help greatly appreciated!