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Old 08-04-2009, 08:53 PM
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Block sanding help with pics

Hi All,

I'm currently in the process of restoring the hood on my car...and needed some advise and tips on block sanding.

What I've done so far is remove all the paint using a paint remover grinding disc. I then decided, as I felt the surface was wavy in or two places to coat the whole hood in filler.

After allowing one day to dry I sanded it using the long board block sander with #80 Grit. Once it felt less wavy and level I used a guide coat and sanded the hood further with #120 grit.

As this is the first time block sanding, I wasn't sure whether me sanding was eliminating the wave in the panel. So I decided the only way for me to know was to spray it in primer and flatten it back. Which I've done. From the reflection I can now see the panel looks straight, maybe just a bit wavy in one or two places.

From the pics below, which technique is best to sand the hood...sanding long from the bottom of the panel to the top ... or sanding sections at a time.

(A)


(B)



(C)


(D)


cheers
holy85

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Old 08-04-2009, 09:44 PM
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Bliemee,A hood is the hardest part of a car to get straight...getting it off the car is how I do it, then I get my office chair(the one with wheels)and my coffee and prepare to be there a while...sanding bondo on a hood is tough ,you have to sand very lightly or else you'll just push the metal when you make a pass then it'll come back up and you've done nothing but waste your time...I use ez sand finishing putty because it sands easy with 80 grit and finer...But sometimes the glue holding the skin to the inner structure prevents getting it just right so there are many times I'll cut the glue with my little air saw releasing the stress and it goes much easier,but try the putty it'll help a lot or there other times you have to glue it in many more spots to stiffen it up...it took years for me to get good at hoods I hope this helps but its the best I can do on a computor.good luck
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Old 08-05-2009, 05:21 PM
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Thanks for the reply.

From the pictures above, does anyone know what the best way is to sand the hood?...sanding long diagonally across or in small areas at a time?
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Old 08-05-2009, 06:37 PM
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You want to sand diagonally across the hood in long strokes. and alternate 90 degrees. I also agree with DBM about sanding lightly so you do not distort the hood. A surface that large is easily distorted by excess weight

Vince
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Old 08-06-2009, 12:14 PM
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The panel definatly does flex with the slightest pressure. Like you mentioned sanding it lightly is the best way.

I didn't sand 90 degrees to that above. So I will definalty take that into account.

What should the sureface be sanded down to before applying the primer?....#400 git?

cheers
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Old 08-07-2009, 06:43 AM
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sand diagonaly but criss cross,like a piston cylinder.I sand to 180,drysand and reprime as many times as it takes, 400 wet then paint,but thats just one wayto do it..
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Old 08-07-2009, 06:53 AM
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never change sand stroke direction in the same place twice.
never change sand stroke direction in the same place twice.
never change sand stroke direction in the same place twice.
never change sand stroke direction in the same place twice.
never change sand stroke direction in the same place twice.
never change sand stroke direction in the same place twice.
never change sand stroke direction in the same place twice.
never change sand stroke direction in the same place twice.
never change sand stroke direction in the same place twice.
never change sand stroke direction in the same place twice.
wake up
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Old 08-07-2009, 08:44 AM
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milo please explain

i dont understand. If you want to go with long strokes wouldnt you go from 1 end to the other? Where else would you start and stop?Thanks
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Old 08-07-2009, 09:34 AM
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it's important where you stop and change direction of a sand stroke. A low spot will develop where the sand paper cuts in twice as much where it stops/starts & changes direction


http://www.a2zautoforums.com/showthread.php?t=936

Still to follow the red arrows yet direction changes are RANDOM hence the term random (sometimes orbital) sander ...

Each of these locations is a direction change point...




Same princable as when buffing. If you stop and change direction in the same place it will burn it in that spot.
Watch the buffer in this video as it never changes direction in the same place twice yet everything gets a even cut...

http://www.youtube.com/watch?v=ybK9g38uW5M
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Last edited by milo; 08-07-2009 at 10:04 AM.
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Old 08-07-2009, 10:10 AM
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Quote:
Originally Posted by 62galaxiguy
i dont understand. If you want to go with long strokes wouldnt you go from 1 end to the other? Where else would you start and stop?Thanks
yes,one end to the other...the longer the stroke the better,use a guide coat ,it'll never lie to you,so being your first time,after 180,wet sand with 400and look at it closely from every angle while its wet...that'll give you a good idea how straight it is but it really takes years to develop a feel and an eye for it so expect the worst and hope for the best...a rubber hose with sand paper wrapped around it works well in the curves of the body lines,dont forget the hood has two curves,one from front to back and another from side to side.so sand from all directions,but you look like your doing fine so keep it up,we'll probably just confuse you more

Last edited by deadbodyman; 08-07-2009 at 10:35 AM.
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