...do a search on sandblasting but have a big pepsi. It'll take a while to read it all!!
Unless you love to do it all yourself, and you plan to use the equip. again I'd recommend paying someone to do it. From my personal experience of buying a pressure blaster, from Tractor Supply, and the sand ect. I will NEVER do anything again that will not go in my blasting cabinet. If you do not have the means to keep the air lines DRY then you'll spend most of your time getting "clots" out of the line than you do blasting....and if you have a big enough air compressor to keep up. Take it so someone that has the major equipment and can get the job done. In the long run you will be much much better off. Lots of others here feel the same way. Think about it!! Unless your a glutton for pain

Oh, the POR15 is some nasty stuff so wear some type mask, use it in a ventilated area, wear the worst clothes, rubber gloves and don't pour out but small amounts at one time. It'll skim on you pretty fast. A quart should coat most complete chassis's twice.
Keep it air tight in the can.
For more hours of reading enjoyment do a search for POR15, and get a refill on the big Pepsi.