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Paint Preparation Questions

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Eric

04-09-2004 12:10:08




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My sheet metal has light surface rust and I am attempting to sand it off. I have been mostly successfull, but small pits are still in the sheet metal. Some of the pits look deep and I do not want to go throught the metal. Should I get all of this back to shinney metal. Also, in and around the bolts holes there is rust that I cannot get off. How do I do this

On preping the cast parts, should I have the hole thinge sand blasted or do something else. There is almost no rust except for in and around the nuts and bolts. I have been playing with wire wheels, etc for cleaning the surface rust off. I am mostly concerned the bolts they all seem to have an oxidized surface that is sound. Short of grinding, I not sure how to get the rust off.

Any help appreciated

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Bill W.

04-09-2004 18:41:22




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 Re: Paint Preparation Questions in reply to Eric, 04-09-2004 12:10:08  
I found on the deeply pitted sheet metal bondo works best. use vinyl physicians gloves and spread the bondo on quickly before it sets up. Just put a small layer on, enough to fill the pitts. Sand it down with #40 grit and furhter with #80 and 220. Finish sand with 440 and you'll have finish that is not pitted and very smooth and you can primer and paint away . Sandblasting any sheet metal subjecs it to possible burn through and greater problems. Sandblasting your cast parts such as body of tractor risks getting sand in places where you don't want it. Use marine or aircraft paint stripper where you can and use wire cup on right angle griner where possible. Treat with rust converter if you wish and prime and paint. I've found Home Depots rustoleum to be great paint. Use Sunrise Red with two ounces of yellow added per quart for red. On grey get one quart smoke grey, one quart of white and one quart of almond all mixed and you'll have a beautiful grey with just a hint of tan. And you'll have enough left over for your next tractor.

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Scott from GA

04-09-2004 18:15:04




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 Re: Paint Preparation Questions in reply to Eric, 04-09-2004 12:10:08  
For (shallow) pitted sheetmetal I've used what is called a Primer Surfacer -- available at an auto paint supply store. You have to spray it on then sand it.Then spray a primer sealer then your top coat.

Good Luck



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javelina al

04-09-2004 18:12:02




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 Re: Paint Preparation Questions in reply to Eric, 04-09-2004 12:10:08  
For small pitted ares I've always used Glazing and Spot putty. It's a one part mix available at most any auto parts store that comes in a tube, as opposed to bondo which is two part and for larger dents. Just spread it over the pitted area, let it cure and sand smooth. And always primer over any bare metal before paint. Good luck.



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Gary

04-09-2004 17:53:36




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 Re: Paint Preparation Questions in reply to Eric, 04-09-2004 12:10:08  
On the cast iron I like to use a needle scaler, works great. On the sheet metal, I take it down to shiny metal with a wire wheel on a angle grinder, or sand blast. Any pitted area can be filled with metal glaze.



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Russ Anderson

04-09-2004 14:14:26




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 Re: Paint Preparation Questions in reply to Eric, 04-09-2004 12:10:08  
Eric:
I have found both POR-15 and Zero-Rust to be excellent products. POR-15 is more demanding and requires more preparation but produces a harder, more durable finish. Both can be put over rusty metal. On the pitted sheet metal I would recommend POR-15 because it will seal and fill the pits. I recently used POR-15 to finish the battery tray on my 2810 and it did a good job. The POR-15 has to be brushed on and Zero-Rust can be sprayed. I've put links to both below (if they come through).

Link

Link


Russ A

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Dan

04-09-2004 13:12:28




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 Re: Paint Preparation Questions in reply to Eric, 04-09-2004 12:10:08  
on the body I roughed up my old paint, presure washed it twice, then scraped off any dirt or grease - then painted over the paint. On the sheet metal, fenders, and wheels - I sandblasted, painted with rustoleum primer, did a light finishing sand on the primer to smooth it out, then painted. Looks great, but took me quite some time for the prep work. I recommend using rustoleum auto primer so you don't have to worry about every spec of rust down in the pits.

Good luck,
Dan

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