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  1. #1
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    Default Body filler question

    This is my first time playing with body filler. What I am using is Rage. After I laid the filler down, about an hour later, I started sanding it down. I am seeing a lot of small pockets in it. Is this caused by air? If so how do I prevent this from happening? I assume I need to sand all the filler out to make the repair correctly. If not let me know.

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    Senior Moderator cor66vette's Avatar
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    The last time I played with filler was when I was about 17 or 18. A lot of things changed in 10 years

    If I remember, you'll need to sand each layer, and fill in those little bubbles and indents as you go with each layer, until there is nothing but smooth body filler ready for prime. That's what I did and it worked okay in my case.

    And now for the disclaimer: I am no body man.
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    CRO Senior Moderator Justa6's Avatar
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    There is a fine topcoat to use. I don't recall the name but it was made by 3M. Comes in a tube like toothpaste. Apply, resand, then you can use a spraybomb sandable primer to finish. Wetsand with 800 til ultra smooth. Been quite awhile since I've used that stuff.
    Always keep em smokin,,,,then let er drift!

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    CRO Senior Moderator Gtdhw's Avatar
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    Applying the filler in thin coats, with a nice firm (but not too firm) amount of even pressure is key. The smoother you lay it down, the smoother it will dry, the smoother the sanded surface will be. On an average spot, rough up the area with 80 grit. Get spot clean/dust free. Apply medium thin layer of filler. Block Sand with 80 grit. Repeat 2/3 times. Do not sand flat. If you do, you will be low after the next sanding steps. Focus on blending the edges, getting a decent transition, and a slightly raised filler surface, all with a block/flat backer. Switch over to 220 grit. Block until smooth surface and transitions are achieved. If the area feels "low" after 220, then you will need to hit lightly with 80, then apply another coat, repeat above steps. This will be something you learn with experience. Here's the best advice that I can give regarding working with body filler..."If you can feel it, you will damn sure see it once it's painted.

    Yes, having "pinholes" is very common. You can mix the filler/hardner in a certain manner, and it supposedly lessens the air trapped in the filler, but this is where the nice, even strokes during application acheive the same thing in my experience. Fir the pinholes that do remain, some can/will be filled with primer. Bigger ones, will need spot puttied, sanded with 400, then re-primered.

    After filler, sanding, primering, puttying, & reprimering, it's time for guide coat. Guide coating is the key to successfull body work IMO.

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    CRO Senior Moderator Gtdhw's Avatar
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    I would not recommend anything finer than 400 grit, pre paint. 400 gets it extremely smooth, and anything finer, will actually get it too smooth. The paint needs the scatches to stick too, teeth if you will. Too smooth = no teeth = peeling. After paint, is for the super fine grades of wet sanding like 800-3000 grit, then compound with buffer to mirror finish.

  6. #6
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    Thanks for the help. I'll apply that information today.


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