I wanted to do work on a treestand I picked up from a buddy of mine. I want to replace the non-skid tape and paint it up a bit. What would be the hardest most durable paint to use? Laquer?

Pool paint !!
you can get it anywhere pool supplies are,and for the standing area of the stand
just add a little sand to a cup or so of paint and paint as normal,this will add
a non-slip to the paint.It worked great for me and stands up to the weather
because it's tough(made for pool chemicals) and water proof.
you can get color dyes to mix with the paint also.

Rustoleum with sand added. - Flat colors.

I own a body shop so obviously I use automotive paint. That pool paint idea sounds good also!

Thanks guys! I found some non-skid paint at a local hardware store in a flat finish almost identical in color to the green that most tree stands come painted from the factories. It looks real good. And is quite hard. I think I'm still going to add some non-skid tape to it though.