How to neutralize Ospho

[Tuxedo]

I think he's asking does he need to neutralize the ospho to use the JB Weld?
My thought would be that it's necessary.

Yes, Chris. Thank you. That's what I was asking. Sorry if I didn't communicate my question very well.

 

[Tuxedo]

^This.

As in 'JB Weld is an epoxy, but it's not the same kind of epoxy as an epoxy primer, so do the Ospho rules still apply?'

To answer Barry's question, I see a lot of people using Kirker over Ospho.

Thanks, Lizer -
Yes, that was my question. JB Weld epoxy is not the same kind of epoxy as an epoxy paint. So I wondered if the same rules apply.

 

[Tuxedo]

Dont leave us hanging. Please give us the name of one epoxy in automotive refinish that works over an acid film.

I trust you are not saying jb weld is the same as Automotive epoxy?

No, definitely not saying that JB Weld is the same as automotive epoxy. It's very different. That's why I said "not all epoxies are the same".
Sorry for not making that more clear.

Just a newbie over here. I appreciate the feedback based on everyone's expertise.

 

[shine]

shit, how figging long does it take to rinse that stuff off ? go ahead , chop that corner and see what happens .
this drives me nuts , 1 1/2 hrs to rinse it and do it right or 3 months to strip and repaint . geeze that's such a hard question.

 

[Barry]

No, definitely not saying that JB Weld is the same as automotive epoxy. It's very different. That's why I said "not all epoxies are the same".
Sorry for not making that more clear.

Just a newbie over here. I appreciate the feedback based on everyone's expertise.

My mistake; I misunderstood.
Barry

 

[Tuxedo]

One more question....
Once new Ospho is put on top of the dried film, and neutralized with water, will it just wipe away, or need to be scrubbed off?
I believe Barry's advice was to wipe with a rag like washing a car, but others have recommended the red scotchbrite pads which is like a fine sand paper.
I know that scotchbrite also makes green pads and blue pads based on level of abrasiveness.
What level of abrasion will it take to get the film off?

 

[crashtech]

One more question....
Once new Ospho is put on top of the dried film, and neutralized with water, will it just wipe away, or need to be scrubbed off?
I believe Barry's advice was to wipe with a rag like washing a car, but others have recommended the red scotchbrite pads which is like a fine sand paper.
I know that scotchbrite also makes green pads and blue pads based on level of abrasiveness.
What level of abrasion will it take to get the film off?

From the SPI Tech Manual;

Neutralizing Skyco Ospho:
Ospho is the only rust treatment we recommend IF needed under epoxy primer. Apply Ospho as needed and leave it on as long as you like. When you are ready to neutralize the dry Ospho, apply one more coat of Ospho over the area to be neutralized and let it set for 5 minutes. Using a clean towel and water, wash off the wet Ospho like you are washing a car then dry with a clean towel. A dry acid film cannot be neutralized or sanded off.

The tech manual directions indicate that any remaining film is removed by the second treatment, water rinse, and drying. The water rinse is a critical step for any acid treatment and one that guys seem to want to skip all the time. If you do your rinse with large amounts of clean water and dry with a clean prep wipe, once the metal is dry you can use any abrasive you want, or none at all.

 

[Lizer]

shit, how figging long does it take to rinse that stuff off ? go ahead , chop that corner and see what happens .
this drives me nuts , 1 1/2 hrs to rinse it and do it right or 3 months to strip and repaint . geeze that's such a hard question.

Takes even less time to just not use it at all.

 

[Tuxedo]

From the SPI Tech Manual;

The tech manual directions indicate that any remaining film is removed by the second treatment, water rinse, and drying. The water rinse is a critical step for any acid treatment and one that guys seem to want to skip all the time. If you do your rinse with large amounts of clean water and dry with a clean prep wipe, once the metal is dry you can use any abrasive you want, or none at all.

Thanks ... So, sounds like the film will basically dissolve, and not need to be scrubbed off with anything abrasive. Just a towel.

 

[Tuxedo]

It turned white when I neutralized it.... Is that what it's supposed to look like before the next step of sanding?
It's not powdery. It just turned the area white.
thanks.

 

[SomedayDriver]

Never used Ospho before, roof had been covered in it prior to going into storage. I've re-wetted it and scrubbed the old residue off then washed wih soapy water. I'm left with blue and yellow coloration and am wondering if I'm not finished neutralizing. There is no white, powdery residue but wiping with a dry cloth will yield an orange-ish result which i assumed was flash rust. Just want to confirm before epoxy.

 

[jwilson645]

This is in Barry's first post.

"
To neutralize the Ospho MUST be wet, so if dry, re-wet with itself and let set one or two minutes and with a clean rag and water, wipe off like washing the car and then dry.
Next, then da car with 80 grit, clean with 700-1 wax and grease remover, let set an hour and coat with an epoxy."

 

[chevman]

You did it perfectly correct IMO, and it looks just the way it should, except it does look like there is still some rust around the drip rail area and window opening. Blasting would be a good way to handle that.

 

[Lizer]

The flash rush is kind of how you know you’ve neutralized it—aka washed it away because water alone won’t neutralize an acid.

Just buzz it with 80 grit DA real quick and you’ll be good to go.