Hi Craig

First let me welcome you to the forum too.
Sorry to hear your p has been so persistant :-/
I can't say I know the product you're refering to, but then, I don't get in contact with much cattle either

But there are some threads on tar-based products with the experiences of people who used them on this site that you might find usefull.
However, as you probably know, p is a mysterious affliction, and different treatments have different kinds of results on different people.....

strange.....
But I think the first step should be to a dermatologist. Have you done that? I don't know about the health care system in Canada, but here you just call one and make an appointment.
And armend with information about conditions and available treatments you can find on this site, you can set out for a "programme" that fits your needs and expectations together with your derm.
Have you ever tried or considdered UVB treatment?
Anyway, there are many things around, so check out the different threads.

Good luck and keep posting (and keep us informed

)
PedroER
