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Old 08-24-2010, 01:59 AM
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black rust stains and SPI epoxy

trying to get my trunk ready for SPI epoxy. its in pretty good shape but the top side sat in bare metal in spots for a couple years. i 80'd the whole thing but still have some black rust stains in it in several spots all around. its smooth to the touch but just cant get the damn things out. i really dont want to try any "metal wash" i never had good luck with any cuz it always turns orange with rust the next day and i read SPI dont recomend using any metal washes..

as you can see the trunk is in good solid shape but just cant get the black stains out!!!! really dont want to seal them with the epoxy but im lost and not sure if i should try some kind of rust treatment or really carfull with a spot blaster, but like i said its smooth to the touch, no big pits please help!


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Old 08-24-2010, 06:11 AM
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A mustang desk???? I'll bite....SPI says no metal prep so you only have two choices prime it and hope for the best...Or do what I do use ospho and clean it right off. easily....I see this all the time and since I ONLY use SPI epoxy I know it works.Just scrub it in with a red scuff pad,wipe excess off and let dry 24-48 hrs sand or scuff well ,clean with W&G remover and spray epoxy. I dont know why they call alcohal & water "metal prep" just read the ingrediants...what it should say is "instant rust" You can save yourself some money going to the drug store and buying alcohal for a buck....BTW,if you used the Ospho back then you wouldnt have the surface rust ,it also protects bare metal...Its made by Skyco do a search on it ,it costs about 15.00 a quart..I've been using it on every car I do for years. dont make the mistake of confussing it with any other rust products.
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Old 08-24-2010, 06:28 AM
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thanks, il give it a try, now i just need to find where they sell it. . and no its not a mustang desk, it my work bench!
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Old 08-24-2010, 06:33 AM
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Any autobody supply store or Sherwin Williams paint outlet.When they sit for a long time its best to use a wax and grease remover first....Try it on a test piece just to get the hang of it ....always sand or scuff before you prime...
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Old 08-24-2010, 06:44 AM
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so scrub it in with a red scottbrite pad till its out then just wipe it off. let it sit for 24-48 hours . .and it wont turn orange? just want to make sure, chemicals and bare metal scare me. and il 80 it again then degrese it then prime.

gotta get the trunk and doors caught up with the rest of the car
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Old 08-24-2010, 04:02 PM
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yup ,thats it ,after it drys just lightly sand with 180 by hand or use a scuff pad (a differnt one)sometimes I wrap the paper aroud the scuff pad and use it like a soft block...it works fairly easy...here a couple links you can check out...but it only works on metal ALL the paint has to come off..When I strip the underside of a deck I use Kleen strip aircraft stripper and a bunch of old scuff pads maybe one of those metal pot scrubbers my wife uses....to get the old paint off...it a lot easier than trying to sand it off and blasting it ,you'll get the media between the skin and inner structure and its very hard to get out....chem stripper works best for me...just dont use a wire wheel on a drill or air tool it'll sling that stripper coated paint all over and remove the paint of everything it lands on .....Dont ask.......http://www.streetfire.net/video/usin...t1_2050901.htm
http://www.streetfire.net/video/usin...-2_2050902.htm

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Old 08-24-2010, 06:50 PM
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Quote:
Originally Posted by deadbodyman
Any autobody supply store or Sherwin Williams paint outlet.When they sit for a long time its best to use a wax and grease remover first....Try it on a test piece just to get the hang of it ....always sand or scuff before you prime...
do you have a part number for the Ospho my sherwin williams reps. apparently worked at autozone (its not in my computer?) so they need a a number for everything.
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Old 08-24-2010, 07:13 PM
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LOL,no part #...but at my Sherwin williams store its right on the shelves as you walk in with the sandpaper and respirators.do you have an auto body supply store near you? Heres what it looks like
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Old 08-24-2010, 07:47 PM
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thats great! i should be able to steer them in the right direction. I get an awsome discount a SW so i hope i can get them on the right track. thanks
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Old 08-24-2010, 09:23 PM
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I did use aircraft stripper on the back side and it surface rusted bad the next day. Usually it don't do that on me excecpt it did it to me on the bottom side of my car.
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Old 08-27-2010, 02:52 PM
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Hard to find ospho. Sw don't have it or autovalue don't have it. Act like they never heard of it. Its just phosporic acid rite? Mabey try menards??
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Old 08-27-2010, 03:03 PM
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Old 08-27-2010, 05:05 PM
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Quote:
Originally Posted by dual4
Hard to find ospho. Sw don't have it or autovalue don't have it. Act like they never heard of it. Its just phosporic acid rite? Mabey try menards??
No,its not just phospric acid ,that would need to be neutralized from what I understand , did you try a autobody supply store?where bodyshops get their materials? they should be in the yellow pages .... or google Ospho or Skyco
or email steve pitcher to find where the closest distributor is to you.
I'll PM them to you...

Its everywhere around here...
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Old 08-27-2010, 06:04 PM
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How do you pronounce "ospho" so I don't sound like a complete dummy when I try to find some 2marrow.
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Old 08-28-2010, 10:38 AM
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