Interior OG paint, remove or paint over?

[Evil_Fiz]

This question is in reference to a 1970 Convertible Karmann Ghia. I will be stripping the car down to bare metal but there are areas that are hard to reach without dipping the entire vehicle. In these areas, where there is OG paint-over-rustproofing, is it advisable to take it down to metal or is it safe to scuff and prep the area and cover with insert recommended product here.

The areas I am referring to are the inner rear fender wells, the area/cavity between the door and rear wheel wells, and other similar areas. I have spent a few hours searching the site but have not found an answer.
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kiwighia68

See my build on TheSamba at:
The K_R_A_K_E_N_N : a 70 Ghia Convertible reinterpreted

[Spezialist]

I wouldn't bother with it, stripping paint in an area just to reapply it sounds redundant.
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[heimlich]

Will anyone see it?
Does it really matter?
Is this some type of show car you plan on selling for an absurd amount of money?
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[63Ragtop NZ]

as long as the OG paint is in good shape and no rust is lurking there really is no need to take it back to bare steel.

in saying that I did get a little carried away with mine, no need to paint the inside of most doors etc... but an't it pretty!
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[Evil_Fiz]

Thank you for the responses so far. I realize it is redundant to remove paint only to reapply it. In all honesty I am hoping that the OG paint can be left alone and simply prepped and sprayed over.

What I would like to hear are more opinions based on experience.
- In your experience, is the OG paint of sufficient quality and adhesion that it can be sanded/prepped and painted over?
- Have you found the hard to reach areas to have hidden rust that needs addressing?

I am not looking to do unnecessary work but I want to finish the car in a way that will ensure longevity and a (as much as possible) rust proof state.

Thanks,
Emil
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“…It's not just about what's interesting. It's also about what's helpful, and it's helpful even if it helps just one other guy working on a Ghia.”
kiwighia68

See my build on TheSamba at:
The K_R_A_K_E_N_N : a 70 Ghia Convertible reinterpreted

[c21darrel]

Good thinking, don't waste time doing things twice when not 100% necc.
As you sand off your paint on exterior parts (doors, decklid, hood) you will come across places with still decent paint...there will be tiny rust spots that go down to metal. Those need to get down to bare clean metal. When you move to interior areas those tiny rust spots wont be there.
When I did the interior of my ghia I did not go to bare metal 100% everywhere and I still spent too much effort where it wasn't needed. You need to be your own judge where it needs to get to bare metal and where good og paint just needs to be scuffed.
Inner fender wells I did go down to bare metal. Yours depends on the condition and if it is original paint. If its not, how good was previous painters prep? I don't typically trust the previous guy
Every area needs to be prepped one way or another. Here is a pic where I did more paint removal than necc and could have saved a couple hours.

But it came out ok.

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[CiderGuy]

What makes you say there is rust proofing under the OG paint ? I have a 70 convertible which looked in great shape, while isn't a rust bucket there is rust in places I wouldn't think there would be rust.

You have a sand blaster, I take it down to bare metal. We don't have west coast cars.
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[Danpa]

[Mike Fisher]

We just repaired & resprayed the exterior diamond blue & saved the OG interior paint on my '69 square.
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[Evil_Fiz]

[Danpa]

In case you just want to spray Ospho (phosphoric acid into some area you can only see with a bore scope, you might want to make one of these;

Dan
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[Evil_Fiz]

Thank you all for your comments and suggestions. I am resurrecting my own thread with new questions.
The prevailing wind appears to blow in favor of "if the OG paint is sound, AND there is no rust, leave the OG paint in place.

- After properly prepping the OG paint, will epoxy primer offer any benefit? I intend to paint the entire interior in white so I can see better when I have to work in the cars nether regions. I will also be painting the pan and suspension in white or light grey for the same reason.

- If epoxy is overkill for the interior, what would be the recommended type of primer to use, if any is needed?

- I have sand blasted the entire chassis and treated it with Eastwood After Blast. I will be coating it with MasterSeries silver and AG-111 grey or white in the fall or winter once the humidity drops. I am thinking of also using MasterSeries silver and AG-111 in the lower third of the interior. Will the MS work well over prepped paint. The MS website says it will but I would like to hear first hand accounts.

Thanks,
Emil
_________________
“…It's not just about what's interesting. It's also about what's helpful, and it's helpful even if it helps just one other guy working on a Ghia.”
kiwighia68

See my build on TheSamba at:
The K_R_A_K_E_N_N : a 70 Ghia Convertible reinterpreted