Lacquer Paint Over Ospho - Vintage Mustang Forums
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post #1 of 10 (permalink) Old 08-17-2019, 11:23 PM Thread Starter
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Lacquer Paint Over Ospho

About 10 years ago, I purchased a quart of PPG lacquer in the correct black satin for the interior panels when I heard it may become obsolete. I am planning to use a modern primer on the dash, yet have concern over filling in the texture on the doors and rear panels. I had considered stripping the paint off the inner panels with chemical stripper and follow up with a coat of Ospho as it can remain unpainted while I finish the body work. When it comes time to paint the textured panels, is their any reason to not just scuff the ospho and paint right over it? I also have a quart of grey lacquer primer, would thinning that a little extra prior to the black be better?

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post #2 of 10 (permalink) Old 08-17-2019, 11:57 PM
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What does the bottle of Ospho tell you?

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post #3 of 10 (permalink) Old 08-18-2019, 12:32 AM
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I would not use ospho on a textured surface like the inner doors.

how long before stripping and painting are you planning?

I would use rattle can primer to hold it since that will easily scrub off later.


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post #4 of 10 (permalink) Old 08-18-2019, 08:42 AM
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I just did mine recently and they came out beautiful. This is how I did them:

1 - I stripped the old paint on the grain textured panels with a sand blaster set at about 60 PSI. It did not effect the grain at all. You could also do this using a softer media like walnut shells but fine grain sand worked good for me.

2 - Once completely stripped I used epoxy primer (Matrix) and reduced it to use as a sealer. One full coat sealed it and agian the grain looked great. Make sure to reduce the epoxy and put it on thin but get full coverage.

3 - Next I applied two coats of base (PPG Deltron). Again, apply just enough for full coverage / hiding.

4 - Next I applied 2 coats of clear (Matrix MS-42 high solids) and I added their flattening agent to get a flat to satin sheen.

The grain looked great and the durability is excellent.
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post #5 of 10 (permalink) Old 08-18-2019, 10:16 AM
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Any time you use Ospho it must be neutralized prior to coating. This can be done with plenty of soap and water and a scrub brush, then use a water borne wax and grease remover prior to re-coating.

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post #6 of 10 (permalink) Old 08-18-2019, 11:43 AM
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I recently had to neutralize Ospho on the front unibody before painting, here's the advice I followed from Southern Polyurethanes:

How to neutralize Ospho

They recommend using Ospho itself with a good rinsing.


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post #7 of 10 (permalink) Old 08-18-2019, 03:15 PM
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Quote:
Originally Posted by lennyB View Post
3 - Next I applied two coats of base (PPG Deltron). Again, apply just enough for full coverage / hiding.
What Deltron code did you use? Looks great.

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post #8 of 10 (permalink) Old 08-18-2019, 11:10 PM
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I chemically stripped mine, wiped down liberally with wax & grease remover, let dry, sprayed down with Picklex20, wiped residue and let dry, shot lacquer primer and color coat. Been 5 years and hasn't peeled, chipped or flaked yet...
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post #9 of 10 (permalink) Old 08-19-2019, 05:31 PM
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PPG Deltron Ivy Gold 1968 Ford Code

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Originally Posted by vegasloki View Post
What Deltron code did you use? Looks great.
Below is a picture of the PPG Deltron formula with the offsets my local vendor noted so they could duplicate it again for me if needed. I took a kick panel in so they could tweek the color to match my interior. That's the best way to get the color just right.
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post #10 of 10 (permalink) Old 08-19-2019, 10:18 PM
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@lennyB thanks a ton for the mix. My local PPG joint went from family owned good place then the family got out and sold to a chain. Getting them to match color is like pulling teeth. Good call on flattening the clear. From the pics the sheen and shade look spot on. The Seymour rattle can NPD carries is a good match but it’s not near as durable as a two stage. Nor is it near as expensive...

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