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Restoring Exhaust Manifolds

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mr69

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Discussion starter · #1 ·
whats the best way to prep manifolds prior to painting or coating? It seems like years ago i remember leaving manifolds in a 5 gal. bucket with some sort of pool cleaner or tablets overnight and that did the trick. I just can't remember....any thoughts?

thanks in advance!
 
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#4 ·
Exhaust Manifolds are CAST IRON steel. One method of restoring Cast Iron is done by a process called FLAME SPRAYING, whereby hot molten aluminum wire is sprayed onto freshly sandblasted cast iron surface to form a thin coating. This aluminum coating must now be painted with a "Cast Blast" paint to look like REAL cast iron......but the new aluminum skin prevents new rust and corrosion from starting.

Chuck Sharin
 
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#5 ·
CamarosRus said:
Exhaust Manifolds are CAST IRON steel. One method of restoring Cast Iron is done by a process called FLAME SPRAYING, whereby hot molten aluminum wire is sprayed onto freshly sandblasted cast iron surface to form a thin coating. This aluminum coating must now be painted with a "Cast Blast" paint to look like REAL cast iron......but the new aluminum skin prevents new rust and corrosion from starting.

Chuck Sharin
Click to expand...
Try www.z28camaro.com :)
 
#6 ·
I also recommend Jerry, he recoated mine using the above method and they still look perfect.
 
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#8 ·
A word about Muratic acid, you can buy this at Lowes and alot of other places. Ihave used it to strip parts.A few things that I learned the hard way do not use this inside the vapors will cause things to rust like drill presses. You can actually watch things rust after stripping them. I got good results as follows: Take the part out of the acid
immerese in water immediatly
blow dry with compressed air
then
paint immediatly
The word immediatly is not used lightly here.
I highly recommend sandblasting instead. thats my .02
 
#9 ·
Just remember to add the acid to the water and not the water to the acid...it will pop and or explode...use gloves and face protection...don't ask me how I know...Mike:D
 
#10 ·
As far as the coatings that are available from the vendors (eastwood, year one, etc.), which have you guys used and have had the best experiences with? Ive used a few different ones, and were good. But a lot have been on customer's cars that I havent been able to follow up on to know the durability. I know the Eastwood product has a 6 month shelf life, which I'm not real crazy about.

Any thoughts/opinions?

dave
 
#11 ·
Dave, The Eastwppd product has about a 6 month shelf life on the manifolds, too....at least that was the case on mine. After that they started to rust. I ended up jet hot coating them. Still look good after 2 years. Only problem is the "Cast Iron" color they used is more like battleship grey. Look good, but don't look like bare cast iron.
 
#12 ·
Just to throw another coating out there along with the Eastwood stuff... POR15 makes a manifold gray coating also.


Typically POR bonds best to rust coated surfaces and every product I've used from them has performed beyond my expectations.
 
#13 ·
I did '57 Corvette ram's horns with Eastwood's "Factory Gray" coating after blasting them clean (and coated them immediately), and they still looked great with no touch-up required six years later. Prep is the key. :thumbsup:
 
#14 ·
Like JohnZ, I too used this Eastwood "Factory Gray" High Temp Coating, but I did them right after I blasted them. I did this 6 months ago and they are sitting in the garage open to the air and usual moisture. So far, they look like I just did them yesterday.
 
#15 ·
I also used Eastwood's coating, about 4 year's ago. Still look pretty good(very slight surface rust), but my prep-work wasn't that great at the time. :clonk: Now that I have a blast cabinet, I'm going to redo them.
 
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