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  1. #1
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    Old school vs Modern sanding

    Hey, guys!

    I'm just wondering if you think there's any substantial difference between sanding a new paint job on a classic car with, say, a Rupes pneumatic sander (Skorpio III) vs hand blocking it.

    Are there any advantages or disadvantages with either method, you think? I've seen both methods being used on cars all the time.

    Thank you!

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  2. #2
    Mike Phillips
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    Re: Old school vs Modern sanding

    Here's my opinion based upon what I've seen.

    If the new custom paint job has orange peel - both methods will reduce orange peel and improve the appearance of the paint. That is increase the D.O.I.


    But if you really want to do it right - go old school and hand block the paint first to flatten the surface and then machine sand with something like the Trizact #3000 or #5000 even #8000 to refine and reduce the depth of your hand sanding marks and then go to machine compounding.




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  4. #3
    Mike Phillips
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    Re: Old school vs Modern sanding

    I teach this in our 3-day classes on REAL cars with custom paint jobs - not demo hoods or demo fenders.


    The below pictures are from this last February. The El Camino has a brand new custom paint job. In this order, the class learned,



    1. Hand wetsanding
    2. Machine wetsanding
    3. How to use a rotary buffer with a wool pad
    4. How to finish out hologram-free - their choice of ANY brand of orbital polisher



    Pictures: February 2020 - 100% Hands-On Detailing Classes


    And more....

    Wetsanding










































    I am proud to say that in my classes - you get to work on the real deal. And my classes are the MOST photo-documented classes on Planet Earth. Go ahead and search for any other class that has more pictures showing what you get to do after you pony up to the table and pay to play.



  5. #4
    Mike Phillips
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    Re: Old school vs Modern sanding

    Quote Originally Posted by Juanito805 View Post

    Hey, guys!

    I'm just wondering if you think there's any substantial difference between sanding a new paint job on a classic car with, say, a Rupes pneumatic sander (Skorpio III) vs hand blocking it.

    Do you have a car with a custom paint job that you're thinking about wetsanding?

    If so - what is it?

    And - have you ever wetsanding an entire car before?



  6. #5
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    Re: Old school vs Modern sanding

    Quote Originally Posted by Mike Phillips View Post
    Do you have a car with a custom paint job that you're thinking about wetsanding?

    If so - what is it?

    And - have you ever wetsanding an entire car before?


    I'm wet sanding a car for a friend - like a Lowrider type of car. But after either block or pneumatic DA, the paint job still looks more or lest wavy.

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  7. #6
    Mike Phillips
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    Re: Old school vs Modern sanding

    Quote Originally Posted by Juanito805 View Post

    I'm wet sanding a car for a friend - like a Lowrider type of car.


    But after either block or pneumatic DA, the paint job still looks more or lest wavy.

    Doe the surface look almost textured? Not a rough texture but just not flat?



  8. #7
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    Re: Old school vs Modern sanding

    Quote Originally Posted by Mike Phillips View Post
    Doe the surface look almost textured? Not a rough texture but just not flat?


    No texture at all - just some degree of waviness all over. Even with 1000 there are still some pinholes too, besides the waves. He said the car had 2 gallons of clear applied to it (its a large one). It's not mirror flat - only about 80-85% there. I just don't want to eat away all the clear.

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  9. #8
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    Re: Old school vs Modern sanding

    I'm not sure sure you're of car it is. I'll add a picture right now.

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  10. #9
    Mike Phillips
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    Re: Old school vs Modern sanding

    See questions below...


    Quote Originally Posted by Juanito805 View Post

    No texture at all - just some degree of waviness all over.

    Even with 1000 there are still some pinholes too, besides the waves.
    The waviness should be fixed when you hard block it.

    1: What are you using for a block or backing pad?


    Quote Originally Posted by Juanito805 View Post


    He said the car had 2 gallons of clear applied to it (its a large one).
    That sounds like plenty of clear to safely cut starting at #1000 grit.


    2: What sanding paper are you using?



    Quote Originally Posted by Juanito805 View Post

    It's not mirror flat - only about 80-85% there.

    I just don't want to eat away all the clear.
    Copy that. Sounds like the goal is mirror flat though.

    3: Have you sanded down the entire car or are you still dialing-in your process?



    Hate to say this but I've come across paints that no matter what I've done to sand and buff - the paint NEVER gets to 100% flat like a mirror.

    There's always a form of graininess to the surface.

    My only theory is some portions of the paint are softer while other portions are harder - (high solids), after sanding when I buff the softer paint abrades away MORE than the harder portions leaving a grainy appearance.


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  12. #10
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    Re: Old school vs Modern sanding

    The entire car done was cut with 1000, 1500, and 2000, at times with pneumatic DA and in part blocked by hand.





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