Refillable Paint Pens

I’ve never tried these:

http://www.dickblick.com/products/montana-empty-markers-and-fluid-ink/

but, they look really interesting…

I wonder if I could fill it with tempera? And if I could trim the tip?

I may pick one up the next time I’m at Blick’s.

Seems like this along with the super-bitchin’ pinline tape that Resinhead sent me and I’d be set for pinlines…