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Eastwood After Blast - Metal Prep is rated 4.5455 out of 5 by 22.
Rated 5 out of 5 by from Great Product! "But Please Read" I have a 71 Camaro that I am restoring sandblasted the car, there are some spots that had the factory e-coat (Factory Primer) still on the car. this was due to it was in great shape. When I used the After Blast on the bare metal it worked Awesome!!! it cleaned and etched the bare metal perfectly! But when the after blast got on the primer it leaves a residue Just be sure to clean it off and scuff the primer. I cleaned it off with prep all (a wax and grease remover) then wiped down the entire surface including the bare metal again with the prep all again using the blue shop towles wiping each wipe with a clean side of the shop towel. I used ppg epoxy primer and followeed it with Eastwoods chassie black paint. I am very happy with the results and happy with the Eastwood products!!!
Date published: 2015-03-10
Rated 3 out of 5 by from After blast I bought the product for prepping the steel for powder coating. I manufacture a motorcycle rack to transport you dirt bike, sport bike and Harley. I built my on oven. I also bought a dual voltage gun from you, very unhappy with the gun, working with Sean to replace it. When I received the product it leaked in the plastic bag and I could not read the instructions so I called and the customer service person had to read the instruction I guess because he put me on hold. I still not sure do you spray and wipe it off or let it try.? I'm pretty sure you don't use any water. Any clarification would help Thanks Richard
Date published: 2015-01-10
Rated 5 out of 5 by from Great stuff! This stuff is excellent for use on any bare metal! After media blasting some rusty areas on the sheet metal on my '67 mustang I found some heavy pitting in areas. I used used paint stripper on the non-rusty areas and used after blast on the blasted areas. Once it had dried and phosphetised the metal it matched the original surrounding phosphitizing metal from the factory of 44 years ago. I filled the pits with metalic filler and coated with 2K Urethane primer and I feel very confident these steps will prevent any future rust. This is great stuff to have in your garage to treat any bare metal. I cleaned some other small parts and once the surface was phosphitized I hit them with a coat of Zero Rust and they look like new!
Date published: 2011-04-22
Rated 5 out of 5 by from Remove and prevent flash rusting! I bought After Blast as it was advertised to clean and stop flash rusting after media blasting, grinding and stripping. I was stripping my 73 Challenger and was having problems with flash rust, especially in the high humidity Houston area. To my surprise, this product cleaned the metal extremely well. Alll the rust, even in small scratches, was removed. I've been using a cleaning disk to remove paint and Bondo, and the swirls in the metal left by the disks seem to be removed by After Blast. The metal actually LOOKS really clean, too! I was a little concerned that one jug of After Blast wasn't going to be enough for my entire car, but I was pleasantly surprised at how far just a little went. I can now use that extra bottle I bought to clean small parts before refinishing as well! Overall, exceeded my expectations and I actually glad I bought this product, and I think you will be too!
Date published: 2010-06-25
Rated 3 out of 5 by from Expensive but works well. I've been blasting parts for my restoration, but am not ready to prime/paint/powder coat them till I have a batch ready. I tried Metal Wash afterwards and it worked but not perfectly. I would still get some flash rust in spots. This works a lot better for protecting the metal afterward though it's slow. The fumes are very potent, even in an open garage they're strong. Use outside or with a mask. A little goes a long way, I have a spray bottle with it in and just a light application is sufficient, and I usually only need one. The parts I've done have been sitting in high humidity heat for a week or two with no signs of flash rust. Still, it's not cheap for something they want you to apply liberally, but it does seem to work. I have yet to see how it affects top coats as I'm not ready to paint or powder any of the parts yet.
Date published: 2010-07-08
Rated 4 out of 5 by from Eliminated flash rusting I used the Eastwood Gel Rust Dissolver to remove all the rust from my dashboard because it could get to areas sanding wouldn't. After rinsing, the metal flash rusted quickly, so I hit it with the After Blast, and the flash disappeared and left a nice coating of zinc behind. It's a combination that worked excellent.
Date published: 2013-01-25
Rated 5 out of 5 by from Excellent Product This is my first time using the product and have been applying to an antique tractor. We had problems with flash rusting after paint removal and using wire wheel, so we tried this. It has worked great in the high humidity and we have not had any reoccurance of flash rust.
Date published: 2012-07-24
Rated 5 out of 5 by from After Blast Hi, I have had more of a chance to use After Blast and I must say it works really good for powder coating. I'm about ready to buy my second gallon but to my surprise you have raised the price, I already thought its was to expensive by the time I get it with freight its well over $50.00 that's a little to expensive. Is there a way to thin it out.? If not I may have to look for a another solution. Thank You Richard
Date published: 2015-02-08
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how do you apply this product and is it ok to drip on driveway and just wash off with hose ?

Asked by: noelmik
Yes this needs to be washed off cement. This product eats lime. You can use After Blast to clean cement off brick. I spilled After Blast on garage floor when filling a spray bottle. I now have a pot hole where it spilled.
Answered by: Ronzo
Date published: 2015-09-25

Do you need too, or should you, rinse with water before painting or powder coating?

Asked by: mark1828
No you need to remove the zinc phosphate coating with "pre painting prep" (10041), a wax and grease remover or acetone before applying any sort of coating over top of it.
Answered by: SeanA
Date published: 2015-11-25

Will this coating dissolve if exposed to hot lubricating oil such as inside a transmission? If so, I'm concerned that the zinc and phosphate would change the chemical properties of the oil.

Asked by: Stude
It should not be applied to the inside of any engine or transmission.
Answered by: MikeL
Date published: 2014-12-15

How long will this product protect against flash rust? Specifically, I am looking to protect my blasted frame (stored in a garage) for several months until I can paint it in the spring.

Asked by: JasonRies
I've had parts coated with this product that have been unpainted for twelve months, and still no flash rust. I'll hit them with some PRE before painting, but this AfterBlast works well. I'm in the Midwest, so if you live in a humid, salt air environment, your results may not be the same.
Answered by: Stude
Date published: 2015-10-09

Is this recommended for cast iron that has been sandblasted?

Asked by: wibob
This can be used on all your fresh blasted cast iron, steel or aluminum components.
Answered by: NickC
Date published: 2014-12-29

What's the difference between this and fast etch?

Asked by: Sea Bass
Fast Etch is a more aggressive product, which allows it to remove heavier rust.
Answered by: NickC
Date published: 2014-09-08

After blasting to bare metal and then applying After Blast, does the zinc phosphate layer need to be removed before priming or can I apply epoxy primer directly over After Blast? Will Eastwood PRE-painting Prep remove the After Blast zinc phosphate layer?

Asked by: Glenn777

is the zinc phosphate that's left behind black In color or grey? and how is it best removed before painting?

Asked by: farley
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Eastwood After Blast - Metal Prep

Item #11971ZP Brand: Eastwood

Cleans, degreases, etches blasted metal to improve paint adhesion


Use "After Blast" after blasting or sanding metal, then paint, prime or powder-coat After Blast cleans, degreases and etches just-blasted or newly-sanded metal to improve adhesion for painting, priming or powder-coating.
  • Spray, wipe and repeat until clean
  • Aqueous cleaners and phosphoric acid clean and etch the metal
  • Zinc phosphate coating improves paint, primer or powder adhesion
  • Also protects against flash corrosion

More info...

About Eastwood After Blast - Metal Prep

After Blast is designed to clean, degrease and etch freshly blasted or sanded metal prior to painting or powder coating. Use with a plastic spray bottle to liberally apply to the part, wipe and reapply until all contaminants are removed. The blend of aqueous cleaners and phosphoric acid properly cleans, etches the metal and leaves a zinc phosphate coating that is excellent for paint, primer or powder adhesion. Also protects the metal from flash corrosion for extended periods. Use on all your fresh cast iron, steel or aluminum components.


1 gallon


Use after abrasive, soda blasting or sanding/grinding operations to assure of a clean paint ready metal surface.


Use in well ventilated area and wear rubber gloves


made in USA 1 year shelf life


Use on cast iron steel and aluminum to clean and properly etch the metal for coatings. The phosphoric acid will etch the metal and provide an excellent surface etch for paint adhesion. Use on frames, sheet metal engine blocks and suspension components after blasting. Do not apply to painted surfaces, chrome, plastic or glass.

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