Should I Spray Down The Whole Car? - Vintage Mustang Forums
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post #1 of 20 (permalink) Old 06-23-2019, 02:28 PM Thread Starter
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Should I Spray Down The Whole Car?

SO I went and got some Klean Strip Concrete and Metal Prep from Home Depot to treat the inner rocker on my 67 S Code Convert Project before I put the inner rocker back in. Says it's phosphoric acid. Smells like CLR. Used a spray bottle to hit that and the convert reinforcement pan on the drivers side. I can't believe how it takes the rust off like right before your eyes. Anyway the whole car has surface rust on it. the previous owner had it blasted and let it sit unprotected for like 10 years. A couple of questions. It says to just put the stuff on and let it dry to treat rust. Is that really the case. and Should I just spray the whole car? Heres a pic of what I purchased as well as a few pics of the car. I did spray the drivers side a bit. Should I just keep going? And do you really just let it dry and call it good?

Car when we brought it home PRETTY RUSTY


Stuff I bought



Pics of the side of the car I sprayed


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post #2 of 20 (permalink) Old 06-23-2019, 04:44 PM
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If you use it, you need to make 100% certain its removed and the metal is neutralized prior to priming and painting. Primers and paints do not play well with with phosphoric acid treatments. if it were mine, I'd be re-blasting the entire car followed immediately by a good epoxy primer.
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post #3 of 20 (permalink) Old 06-23-2019, 04:55 PM Thread Starter
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Kinda already started where I sprayed the drivers side. Do you really just let the stuff dry rather than take it off before it dries?

Troy Arave
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post #4 of 20 (permalink) Old 06-23-2019, 05:51 PM
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I would follow the advice of re blasting the entire car then epoxy prime. Yes, you let it dry.
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post #5 of 20 (permalink) Old 06-23-2019, 06:20 PM
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How to neutralize Ospho | Southern Polyurethanes Forum

Here's how SPI says to neutralize it...

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post #6 of 20 (permalink) Old 06-23-2019, 06:58 PM Thread Starter
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Thanks, Turnall, thatís way helpful. Cmefly, I may still have it blasted but I started spraying this stuff and was quite impressed. Originally was just going to use it on the inside of the outer rocker to hit the small amount of rust I couldnít get manually. But this just seems too easy not to do it. Was thinking the phosphoric acid and then Master Series.
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post #7 of 20 (permalink) Old 06-23-2019, 07:05 PM
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Master Series Silver is totally compatible with phosphoric acid!
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Ex-wife,....."You drove how far for that thing?"
Daughter,..."Theres no inside and it stinks."
Friend,......."Dude, thatís a rusted pile."
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post #8 of 20 (permalink) Old 06-23-2019, 07:22 PM Thread Starter
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Quote:
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Master Series Silver is totally compatible with phosphoric acid!
Perfect!! Should I be worried about this white stuff?




Troy Arave
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post #9 of 20 (permalink) Old 06-23-2019, 07:43 PM
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Whatís the white stuff?

Ex-wife,....."You drove how far for that thing?"
Daughter,..."Theres no inside and it stinks."
Friend,......."Dude, thatís a rusted pile."
Son,.........."This old car is cool."

USMC Security Forces, Kamiseya Japan, 0311

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post #10 of 20 (permalink) Old 06-23-2019, 07:44 PM
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If it were me, I would follow the SPI instruction anyway. You will be surprised how well the metal looks after you wipe it down per their direction.

Try a small section and you will see.

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post #11 of 20 (permalink) Old 06-23-2019, 07:47 PM Thread Starter
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No idea What the white stuff is. Just started happening as the acid is drying. Think Iíll go wash it off real quick.

Troy Arave
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post #12 of 20 (permalink) Old 06-23-2019, 07:53 PM
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https://forums.vintage-mustang.com/b...ml#post8344817

You can see my engine bay on my 66 GT using phosphoric acid. It looks like hell just sprayed and left. Not sure how any of the paints would adhere to it that way. If you look around on my build thread that's linked, you will see I used master series silver over the acid after wiping it all clean and have had no problems.

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post #13 of 20 (permalink) Old 06-23-2019, 08:05 PM
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Quote:
Originally Posted by carguytroy View Post
No idea What the white stuff is. Just started happening as the acid is drying. Think Iíll go wash it off real quick.
Stop screwing around and blast the car. You are at risk of not getting all the rust treated properly.
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post #14 of 20 (permalink) Old 06-23-2019, 08:48 PM Thread Starter
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Quote:
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https://forums.vintage-mustang.com/b...ml#post8344817

You can see my engine bay on my 66 GT using phosphoric acid. It looks like hell just sprayed and left. Not sure how any of the paints would adhere to it that way. If you look around on my build thread that's linked, you will see I used master series silver over the acid after wiping it all clean and have had no problems.

Allen
Right on. The white stuff kinda freaked me out there for a sec. I just got done wiping down. Looks much better.
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post #15 of 20 (permalink) Old 06-23-2019, 08:53 PM Thread Starter
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Stop screwing around and blast the car. You are at risk of not getting all the rust treated properly.
Iíll probably do both. I have the inner rocker out on the drivers side and was using the stuff to get a couple of places I could not get to. Weíll see. I have already contacted a dustless blasting place that will blast the car for 1000.00 at the house. I want to get the floor put in it and then have him come hit it. In the mean time Iím still screwing around with this stuff. Iíve been known to overkill things. Just how I am.

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