We've about reached the point of being ready to have my 60 Metropolitan prepped for painting. The big decision is which way to go. I hear horror stories ofr sand blasting warping body panels, soda blasting preventing paint from adhering and the more people I talk to the more confused I am,. Any one have experience with their cars being either sand or soda blasted or some other media? Any input appreciated! :confused:
02-27-2006 08:59 PM
Sand,soda, or media:
I've used sand and media,just get it primered right away[Same day if possible] As rust will start before the blaster gets around the other side[not quite that fast]Yes it peens the metal and if blasted to long can weaken metal severely,but it is very effective at getting metal ready to cover.If any rust is left cut it out!So go for it,you will be pleased with the results,I was,Danny.
02-28-2006 05:51 AM
i do it for a living. sand is not the way to go. i remove paint with acrylic and then clean up any rust with starblast. starblast also leaves a good anchor patter for your epoxy.
sand does not create heat, it stretches the metal on one side . you can go to my web site and see some results of this system.
02-28-2006 06:38 AM
I guess really all blasting is media,as sand,soda,and plastic etc., are all just different medias used for blasting.
I use superfine copper slag,and I stay away from any large flat areas,such as door panels,roof,hood,and trunk,those areas are easy enough to hand sand anyway.
Soda blasting here is very expensive,and I'm told that soda is corosive and must be neutralized with chemicals after blasting.
I've also used walnut shell,but it won't remove rust,and some paints are very resistant to it.
I've also found that some medias can embed particles in the metal,so I go over the whole thing with 3M pads to remove them afterwards.
Thanks shine -- these wiki articles may be helpful to you:
...oops, my error :D
08-22-2010 11:35 AM
a road runner i did last winter i had soda blasted. when the car was done i the guy that did it told me to wash it with vinegar (big mistake) flash rusted immidately. luckly i did it on a hood i didn't think i was going to use. after that i washed with soap and water and the wiped the parts down with thinner then a strong wax and grease remover, next i sanded the out side of the panels down wax an grease again the epoxy primed them had no problems (yet).
gatorblaster since they blocked your link can you send it to me.
08-22-2010 12:52 PM
first vinegar is acidic and should never be used on metal . second lacquer thinner is the absolute worst thing to wash with. there is a reason most paint mfg advise against soda. look at the wiki articles that are here. ever year or so some retiree with a soda trailer comes here hawking work and it just ends up in a huge pissing match. use the search feature on this site.
08-22-2010 01:40 PM
thats why from them on i mechanically strip exterior and i have been blasting the jambs and hard to reach spots once i put the car on my rotissery, makes life easier. i wish i had found this site when i did that car cause everything i found kept saying to wash with water. didn't sound right to me.
edit i guess i had no problems because i washed the car with detergent and water with a red scuff pad like the wiki article suggested.
08-22-2010 02:19 PM
i wash every car i blast . nothing wrong with it . if you get an orange tint that means it is clean. epoxy and go. but you leave any acidic residue on it and you will have adhesion problems.
04-03-2012 10:03 PM
the problem with soda is it doesnt get rid of the deep pitted rust. and the orange residue wont be there if you use a media like garnite which we use. also you have to sand or give it an etch after soda blasting. its basically pointless and you dont save anytime.