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Old 01-05-2019, 05:17 AM   #1
Steve Plucker
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Default After Sandblastig...What have you found...

After sandblasting a part, what have you found best to treat the part with before painting if left for a period of time?

Thanks.

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Old 01-05-2019, 07:49 AM   #2
BILL WILLIAMSON
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Default Re: After Sandblastig...What have you found...

Primer & then paint it.
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Old 01-05-2019, 08:25 AM   #3
BRENT in 10-uh-C
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Default Re: After Sandblastig...What have you found...

Phosphoric Acid. There is general metal prep at the big box stores that have Phosphoric Acid mixed in.
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Old 01-05-2019, 08:40 AM   #4
Oldbluoval
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Default Re: After Sandblastig...What have you found...

Brent-
Do you treat as such if priming within hours of the blasting?
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Old 01-05-2019, 09:14 AM   #5
Alaska Mike
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Default Re: After Sandblastig...What have you found...

I agree with Brent, phosphoric acid. I have kept parts for almost a year after treating with phosphoric acid. You can spray or brush it on. I use a foam brush for small parts, and usually treat everything I do.
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Old 01-05-2019, 09:59 AM   #6
Kurt in NJ
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Default Re: After Sandblastig...What have you found...

I like "picklex20", I have stuff hanging around that was treated over 5 years ago, the treated metal welds nicer too, on modern cars that live outside I have stopped repeating reoccurring rust bubbles from ordinary body shops with sandblasting, picklex20, epoxy primer--- more than 10 years with no signs of any rust
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Old 01-05-2019, 10:17 AM   #7
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Default Re: After Sandblastig...What have you found...

Warped sheet metal.
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Old 01-05-2019, 10:33 AM   #8
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Default Re: After Sandblastig...What have you found...

+2 Brent. Phosphoric acid works great. It stops the rust and gives the paint (primer) a good base. I use a product called Ospho, But there are others. Be careful some metal preps are mostly water with a little acid mixed in.
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Old 01-05-2019, 10:42 AM   #9
Bob Bidonde
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Default Re: After Sandblastig...What have you found...

Pluck,


In 1979 I used lacquer primer and a Rustoleum gloss black enamel top coat (fish oil base), and to date there are not paint failures or rust on those parts.


From 1998 to 2016 I used Krylon epoxy primer and Krylon gloss black enamel on parts that were absolutely rust free. I also used POR-15 Chassis Black epoxy on bare metal with a top coat of Krylon gloss black on parts that had some residual rust, and parts I wire brushed clean.


POR-15 adheres tenaciously to bare metal, clean or rusty but it fades when exposed to the ultraviolet rays in sun light. The Krylon top coat is cosmetic, to avoid fading.



Most importantly, all of my parts were cleaned with lacquer thinner before any painting.


When using POR-15 or other epoxy primers, you need to consider that these paints are very strong thread lockers. Also, epoxy paints adhere very well to human skin.


With POR-15, a little goes a long way. I did my the frame and most of the running gear of my 190A with just two half-quart cans applied by cheap throwaway brushes. Each part was given 2 light brush coats of POR-15. POR-15 flows so well that there are no residual brush marks.
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Old 01-05-2019, 01:18 PM   #10
chrs1961815
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Default Re: After Sandblastig...What have you found...

Spraying it with a very heavy epoxy primer that I use. If you drop it in water for a while it doesn't rust. It also can sit around for years.
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Old 01-05-2019, 01:33 PM   #11
J Franklin
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Default Re: After Sandblastig...What have you found...

OSPHO - I use it always on fresh bare metal.
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Old 01-05-2019, 08:01 PM   #12
burner31
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Default Re: After Sandblastig...What have you found...

After blasting my fenders I found lead filler.
Old school repairs...no bondo
Side question: When did they start using bondo?
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Old 01-05-2019, 08:05 PM   #13
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Default Re: After Sandblastig...What have you found...

I had first hand knowledge in early 60's
It was a well known commodity then
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Old 01-05-2019, 10:11 PM   #14
chrs1961815
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Default Re: After Sandblastig...What have you found...

Quote:
Originally Posted by burner31 View Post
After blasting my fenders I found lead filler.
Old school repairs...no bondo
Side question: When did they start using bondo?
Bondo was introduced in 1955, though a few products similar to it were around in the late 40's. It was originally meant to fill in small imperfections in metal but people got lazy and started filling dents with it that we see on our antique vehicles after they have been sandblasted today.
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Old 01-05-2019, 11:52 PM   #15
Steve Plucker
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Default Re: After Sandblastig...What have you found...

Thank you all for the information...Will have to digest it all before I do some major parts cleaning.

Pluck
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Old 01-06-2019, 09:17 AM   #16
BRENT in 10-uh-C
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Default Re: After Sandblastig...What have you found...

Quote:
Originally Posted by Oldbluoval View Post
Brent-
Do you treat as such if priming within hours of the blasting?
No Bill, since there are many DTM primers ( -such as SelectPrime ) or even epoxies that can be applied first and then filler added to the top. Generally we use the Phosphoric to give us some 'hold time' between blasting and metal repair. Once finished we wash the metal with Wax & Grease remover to remove the Phosphoric from the pores.
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Old 01-06-2019, 09:25 AM   #17
Oldbluoval
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Default Re: After Sandblastig...What have you found...

We're on exactly the same page on it
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Old 01-08-2019, 07:37 PM   #18
Res731
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Default Re: After Sandblastig...What have you found...

Do you have to remove the phospho before painting? I thought it can be used as an etch and can be painted over ?
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Old 01-08-2019, 09:30 PM   #19
J Franklin
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Default Re: After Sandblastig...What have you found...

Follow the instructions, you can paint directly over it.
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Old 01-09-2019, 08:20 PM   #20
37 Coupe
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Default Re: After Sandblastig...What have you found...

Gibbs brand lubricant is another option and they state that it is safe for painting over it later. It is sold on Ebay and great as a rust preventative on guns and any metal. I have used it to prevent rust on metal sandblasted and cannot get to right away and clean later with mineral spirits or lacquer thinner than use the acid others have mentioned for adhesion. I think Gibbs is paint friendly cause of no silicones.
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Old 01-11-2019, 11:45 AM   #21
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Default Re: After Sandblastig...What have you found...

What have I found after sand blasting? I found out that I need a Beer.
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Old 01-11-2019, 08:58 PM   #22
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Default Re: After Sandblastig...What have you found...

The only way to prevent rust from eventually bubbling through the paint some years later is to use quality automotive grade epoxy primer under your paint. It's expensive, but will not allow any moisture pass through the finish. Lacquer primer begins absorbing moisture from the air as soon as it dries and will eventually rust through the primer, depending on ambient humidity if not top coated

Phosphoric acid goes inert once dry and will not provide long term protection if exposed to high humidity.
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Old 01-18-2019, 06:42 PM   #23
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Default Re: After Sandblastig...What have you found...

Sunlight
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