Admission is Free so I'll chime in with my opinion. First I like the POR 15 just follow the precautions and wear bad clothes, use throw away brushes and have a little air movement. Cheap brushes will leave a bristle here and there but keep on trucking. No big deal or pull them off later.
Also, I like to drill a 1/4" hole in the top of the POR15 can and pour out a little at a time. It will skim and dry fast when you have a little wind moving around. I put a piece of duck tape over the hole after wiping clean. I have went back and use the stuff months later. You just can't let it dry which it will in a skinny minute. (Carl, a skinny minute is faster grease lighting)
Even though you can use POR15, and rustencapsulator, over rust, my conscience would not let me do it since I had a bare frame. The por15 will not do its job if put on/over any grease, sand, or greasy stains.
Do a search on sandblasting and you'll find plenty of reading as well as search POR15. Much has been said about both. The por15 will take about a month to come off your skin so wear gloves.
......I had my chassis on two saw horses with a big piece of plastic on the ground. Even had a mild wind blowing but no neighbors were at home! The sand basically fell to the ground and in the end I shoveled up the used sand and sifted it though a screen type gizmo made for that purpose. Use it to finish up the chassis but the finer sand was a little more dusty.....but no neighbors complained.
FYI...for what its worth, I get "dust" when I use my blasting cabinet after which I use the air hose to blow it out the door or a fine bristle broom to sweep it up and use a vacuum cleaner.
So many ways.....but most use what they have.
