I have not seen the video but what I teach and practice myself is to use the least aggressive process to get the job done.
I don't know if the paint Larry was working on would be considered antique or original as I have not seen the video.
IF it was antique single stage paint I would not have wetsanded it but instead would have used the product and techniques I present in this article you're posting your question to.
The Secret to Removing Oxidation and Restoring a Show Car Finish to Antique Single Stage Paints
Rubbing oxidized antique paint down with #7 and a piece of cotton terry cloth is the least aggressive process I can think of to restore antique single stage paint.
Wetsanding antique single stage paint is the most aggressive process I can think of to restore antique single stage paint.
So if the car and the paint were antique I would not myself wetsand the paint or recommend it. If he was working on modern or recent paint then I personally would have probably not started out by wetsanding but I don't know the back story on the car, the paint or the project. I'm sure Larry did know the story and his procedure was spot on for his purposes.
If I go by just what you shared above, this part,
very old oxidized Porsche
Then I would personally would NOT wetsand the paint on the Porsche. I've been doing the #7 rub-down all my detailing life and I've been sharing this technique ever since I started posting to the Internet and I've been contacted by HUNDREDS if not THOUSANDS of people over the years that have followed the techniques I share for saving antique paint with nothing but glowing stories of success.
Rubbing with #7 and terry cloth and your elbow grease is very safe and very effective on this type of paint and that's what the goal is... safe and effective.
Wetsanding removes paint
Compounding to remove your sanding marks removes paint
Polishing to refine the results of compounding removes paint
That's just a little too much emphasis on removing paint for my taste when working on antique single stage paint and especially when it's someone else's car.
Read this write-up and look at the pictures and know that this antique single stage paint was saved by the simple approach.
Pictures: 1958 Cadillac Extreme Makeover- Original Single Stage Paint!
BEFORE
AFTER
And the above was done without wet sanding... just a little elbow grease, some cotton terry cloth and a product that's been around since the time of the Model T.
Where you at with this project? I'm confident you'll make the right decision and the car will come out looking beautiful!
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