Its easy if its not windy. You don't have graffiti artists in your area??? You can't use those things inside you need good ventilation. I won't even use them in my garage with the door wide open.
I do it after I put the posts 2 feet into the ground. Each can will cover 10 sq feet. I am only covering 2 square feet of post which leaves me plenty of extra. I spray the first post with the initial coat of the entire first can. Then I move onto the next post while the first one dries. Repeat procedure. Then back to first post again with second can and then 2nd post.
I have used them on wood my whole life along with just about any other material I could find when I was a kid.
Okay Addie..........
Unless you have primed or pre-painted posts, I don't see how you... or anyone else, can paint a post outside with a rattle can.... with any regards to quality for the finished product. One month or 6 months.
The reason you don't want to use them inside is because of all the lacquer or solvents in them to make them dry so quickly.... and when you use them outside, the air will dry it almost 50% before it hits your posts. Now, unless you have hundreds of runs in your post, I still can't see how you can paint treated or non-treated posts with only rattle cans. Do you hold cardboard up against the
sign to keep overspray form getting on it... or are you that good you can spray in the little areas and not need any touch-up ??
Up here, the posts go in the ground 40", but that's besides the point. The amount of square footage you're talking about is physical square footage. With a rattle can, half of your coverage goes up in the air.
When we ever paint out in the field we will use those little 3" shurfine rollers and throw them away when finished. But we're actually getting a coat of paint on the posts and not some fine mist of 50/50 solvent/pigment combination. You're talking aerosol cans, not two part spray booths.
I guess I should back up and re-word it..... why would you use a complete inferior product for painting a professional
sign and post setup ?? Rattle cans are not for finish work for exterior projects.... even a one month
sign.
Please Addie.... next time you do this, take a few pictures for me. Seriously, I'd really like to see this in action.