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  1. #1
    Director of Training Mike Phillips's Avatar
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    How to use Meguiar's Unigrit Sanding Blocks to remove runs and dirt nibs in paint

    How to use Meguiar's Unigrit Sanding Blocks to remove runs and dirt nibs in paint


    Meguiar's Unigrit Sanding blocks are solid blocks of precise, uniform grit particles that can be used to remove above surface paint defects like runs, sags and dirt nibs protruding out of the paint.

    Dirt nibs = dirt particles or other contaminants that land or lodge into fresh paint before it hardens to dust free or tack free.

    Meguiar's Unigrit Sanding Blocks are available in 3 different levels of aggressiveness.

    #1000
    #1500
    #2000



















    Dressing or shaping Unigrit Sanding Blocks
    Before using a Unigrit Sanding Block, knock down the sharp edges by rounding them off this will prevent you from gouging or scratching the paint. Remember, if you're working on fresh paint, (whee these sanding blocks are normally used), the paint will tend to still be soft as it hasn't fully dried and hardened.

    To dress your Unigrit Sanding Blocks you can use a more aggressive sheet of sanding paper to round the edges.

























    Rinse off grit particles
    After dressing your Unigrit Sanding Blocks, it's a good idea to rinse them off before placing them in your bucket of water to prevent contaminating your water source.











    Soak before use
    Before using Meguiar's Unigrit Sanding blocks first soak them in clean water until they sink. This is a sign that the blocks have completely saturated throughout with water.

    Keep your Unigrit Sanding Blocks in a bucket of water when using them so you can quickly and easily dunk the blocks into the water and rinse any particles off as you're using them. When not in use, Meguiar's Unigrit Sanding Blocks can stored in water to keep them saturated with water and ready to use. Change your water often to help prevent contamination.


    Lubrication
    You can add a few drops of soap to increase lubricity in the water. If working in a body shop (fresh paint environment), be sure to use a body shop safe soap.




    Grit Guard Inserts
    To trap any loosened particles of paint or grit particles that wear off the Unigrit Sanding Blocks you can place a Grit Guard Insert in the bottom of your bucket. Some people even use two Grit Guard Inserts to help ensure any abrasive particles on the bottom of the bucket don't migrate.



    Mike Phillips
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  2. #2
    Director of Training Mike Phillips's Avatar
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    Re: How to use Meguiar's Unigrit Sanding Blocks to remove runs and dirt nibs in paint

    How to remove a run or paint sag
    To remove a run, you want to use the side of the block and only sand on top of the run. If the run is thick, you can place tape on the sides of the run to prevent you from sanding on surrounding paint while knocking down the run. At some point you'll have to remove the tape and at this point focus on the task at hand and hold the block in such a way as to only sand on the high points of the run.










    Back and forth direction
    Holding the Unigrit Sanding Block firmly, use a fast back and forth motion to sand the run down flat.



    Use fingers as a guide
    On the panel below, the run was just below a raised body line. The run was too close to the raised body line to use tape to cover the body line so instead I placed my fingers on the raised body line and used my fingernails as a guide or bumper to prevent my hand motion from running the sanding block over the paint on the raised body line.





    Here I've sanded just a little and then stopped to take this picture as the sanding marks have made the run easier to see and capture on film.



    The section above was sanded flat and then the sanding marks were buffed out using a compound and a wool pad on a rotary buffer. Next I continued to move down the fender sanding the run flat.



    After the majority of the run has been sanded flat I re-sanded the entire area using a Meguiar's 3" #3000 Unigrit foam backed sanding disc on a Griot's Garage 3" Mini Polisher to refine the sanding marks left by the Unigrit Sanding Block to a more shallow depth to make removing faster and easier and without generating as much heat.



    Here's another run sanded flat using a Unigrit Sanding Block



    Here's Robert DiTerlizzi of Impressions Fine Detailing sanding out a run on the high side of the rear fender body line.



    After sanding the run flat Robert will dampsand using a Meguiar's 3" #3000 Unigrit foam backed sanding disc on a Griot's Garage 3" Mini Polisher and the buff the area using a compound with a wool pad on a rotary buffer.




    Griot's 3" Mini Polisher works great as a 3" Dampsander


    Most people don't need to wetsand and probably shouldn't wetsand but if you're ever working on a project that requires sanding then do yourself a favor and get yourself a Griot's Garage 3" Mini Polisher and then get the Meguiar's 3" Unigrit Finishing Discs and the 3" Interface Pad and you're going to love what this little tool can do.


    Here's a few pictures from our recent Wetsanding Project where we machine dampsanded my friend Jay's 1989 K5 Blazer which you're going to see on the 2nd Season of our TV show, What's in the Garage".

    Because the 3" sanding and finishing discs have such a small footprint the are EASY to control so you can sand close to edges or tape lines with accuracy.

    If you're NEW to any type of sanding, the Griot's 3" Mini Polisher used as 3" Dampsander is a great way to learn and increase your confidence in the art of machine sanding.




























    End results...
    After the orange peel, runs and dirt nibs were removed, the paint was compounded and machine polished and after 30 days air dry the paint was sealed.
















    Don Yenko Stripe Package
    After all the hard work was done Jay added a Yenko stripe package. Jay's thoughts on this were that Don Yenko never built a Yenko Blazer but if he did it would look something like mine.










    Be sure to watch for Jay's K5 Blazer on the second season of Autogeek's What's in the Garage"


    Mike Phillips
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  3. #3
    Director of Training Mike Phillips's Avatar
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    Re: How to use Meguiar's Unigrit Sanding Blocks to remove runs and dirt nibs in paint

    Mike Phillips
    Director of Training Autogeek & Marine 31
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  4. #4
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    Re: How to use Meguiar's Unigrit Sanding Blocks to remove runs and dirt nibs in paint

    Thank you for this Mike.

    Having never seen the sanding blocks (in person) I thought they were much bigger, NOW I understand them a whole lot better.

    Bill

  5. #5
    Director of Training Mike Phillips's Avatar
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    Re: How to use Meguiar's Unigrit Sanding Blocks to remove runs and dirt nibs in paint

    Quote Originally Posted by BillE View Post
    Thank you for this Mike.

    Having never seen the sanding blocks (in person) I thought they were much bigger, NOW I understand them a whole lot better.

    Bill
    Like the old saying goes...

    A picture tells a thousands words...


    I'm good friends with the guy that painted the 1934 Ford Pick-up with the blown Hemi engine and he's asked me if I want to do some sanding projects for him in the future so when I can I'll show these cool little tools in action.






    Mike Phillips
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  6. #6
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    Re: How to use Meguiar's Unigrit Sanding Blocks to remove runs and dirt nibs in paint

    impressive

  7. #7
    Senior Member shoeless89's Avatar
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    Re: How to use Meguiar's Unigrit Sanding Blocks to remove runs and dirt nibs in paint

    Wow amazing! Way to increase your carbon footprint Mike lol
    Rule 62: Don't take yourself to d*mn seriously
    Cincinnati, OH
    Shawn

  8. #8
    Director of Training Mike Phillips's Avatar
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    Re: How to use Meguiar's Unigrit Sanding Blocks to remove runs and dirt nibs in paint

    Quote Originally Posted by shoeless89 View Post

    Wow amazing! Way to increase your carbon footprint Mike lol

    Hi Shawn,

    The 1989 Blazer belongs to my friend Jay, so that would be his carbon footprint.

    (I'm not sure if I'm even reading your post correctly?)


    Jay also won Show Class Winner at the 2012 Super Chevy Show at Palm Beach Internatioinal Raceway after we sanded and buffed the paint...


    3 "Best of Class" wins for Autogeek Forum Members at Super Chevy!





    Jay's Award Plaque



    Jay with his Award Plaque





    :D
    Mike Phillips
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  9. #9
    Director of Training Mike Phillips's Avatar
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    Re: How to use Meguiar's Unigrit Sanding Blocks to remove runs and dirt nibs in paint

    ***Bump***


    For anyone doing touch-up paint work, the Unigrit Sanding Blocks will work as long as you work them very carefully.



    Mike Phillips
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  10. #10
    Senior Member TheCougarGuy's Avatar
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    Re: How to use Meguiar's Unigrit Sanding Blocks to remove runs and dirt nibs in paint

    Mike,

    Is there a reason why the edges aren't taken off during the manufacturing process?

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