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Old 07-20-2009, 11:46 PM
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Need advice on block sanding please

This is my first time block sanding. I've done a lot of research , but most of the information I found is on sanding filler for small areas, not entire panels like this.

Am I taking down too much filler? I'm currently using 80 grit.

At what point do I switch to 150 or 220 grit?

I started on the upper right corner and working my way down, then to the left. The lower curve area is tough to reach. I think i need a more flexible block here.

I really appreciate your thoughts.
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Old 07-21-2009, 01:21 AM
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Tech on block sanding

Try this website: click on restoration there is lots of DIY info there.
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Old 07-21-2009, 08:48 AM
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From your picture it looks as though you already have the proper sanding blocks so I will not go into that. You will use 80 or even 36 grit to first knock down the new filler. Once you no longer see un-sanded filler then switch to 180. You also need some type of guide coat to indicate low spots. Some will advocate the use of a cheap spray bomb of contrasting color paint to do this. What I have found works even better than that is 3M's "Guide Coat". It is a black powder that easily indicates any low spots. There is no paint to sand away and the powder can even be used wet. A tub of it will last through 5 or 6 cars, so it goes a long way.

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