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Antique Tractor Paint and Bodywork

Order of bodywork steps?

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Ken52M

12-21-2007 11:09:41




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I have sheetmetal pieces blasted & treated w/ phospho. Need to apply bondo to some areas. Should the pieces be primed b4 the bondo is applied? Thx for any advise offered. Ken B




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Brad_bb

01-10-2008 09:00:41




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 Re: Order of bodywork steps? in reply to Ken52M, 12-21-2007 11:09:41  
1. Use a good epoxy primer like PPG DPLF or Dudpont or one of the other name brands. Fillerwork can be done on clean, metal prepped bare metal or it can be done over epoxy sealer primer that has been scuffed. Epoxy primers are sealing primers. They are thin and non porous and are not intended to be sanded. By sanded I mean used as filler primer and blocked. Metal prepped means cleaned of all rust and a final washing with mild phosphoric acid such as Dupont Metal prep, ppg DX579 or one of the many other names for the same product. Rinse and dry it comepletely before bodyworking begins. Scuffing is done with a maroon scotchbrite pad. I use Evercoat Z-grip filler and it sands well. Evercoat is also good for small spot fill areas. I also use Claussen Rust Defender, a sprayable filler(not primer). It allows you to lay a thinner more even layer of filler on or spot shot, to reduce the amount of filler you have to sand off, which is wasted energy. After you roughout your spreadable filler work with 80 grit, I shoot sprayable filler and sand with 80 or 150/180 depending on how much more rough out I need to do. I shoot another coat of sprayable filler and sand with 180 or 150. Continue this until satisfied with results. Then shoot filler primer(usually urethane like RMDP20 or PPG K36). Sand with 320. Do this as much as needed until satisfied. I then shoot a coat of sealer primer(epoxy) to seal the bodywork. Not everyone does this, some seal with the urethane filler primer. Then paint. Or if it"s let sit beyone the top coat application window, you"ll have to scuff, then tack rag, then paint. If doing a show car you may finish with 600 wet sand before paint.
FYI, paint will fill 320 scratches, but will not fill 150/180 scratches. Filler primer will fill 150/180 scratches, but does not fill 80 well(it takes multiple coats).

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Kent in KC

12-23-2007 06:39:45




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 Re: Order of bodywork steps? in reply to Ken52M, 12-21-2007 11:09:41  
Ken,

Spend $20 for a book called How To Paint Your Car. It breaks it all down, step by step. One of the best I've seen for a beginner.

As Glennster will tell you, the two best pieces of advice are buy all your products (filler, primer, paint, etc. ) from one mfr since they are chemically designed to work together. Also, follow the directions exactly. Yeah, I know, real men don't read the label but do it anyway. Don't ask how I know.

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glennster

12-21-2007 14:40:23




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 Re: Order of bodywork steps? in reply to Ken52M, 12-21-2007 11:09:41  
apply the body filler now before you prime.



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