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picklex, epoxy

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Big Hunter

07-06-2007 18:23:52




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I'm not to this stage yet but I just wanted to be thinking ahead. I have an Allis Chalmers 190XT that I am completely tearing down and rebuilding to new. When I get things rebuilt and put the tranny, torque tube and engine back together I was going to sand blast it. My question is...After I sandblast I'll wash it down with soap and water? Then spray Picklex 20? And how many coats of Picklex 20? Then epoxy primer? Does the epoxy need hardener in it? And how many coats epoxy primer? And do I use the Picklex 20 and epoxy primer on the engine block or something else? Yes as you can see I have no experience. I do value your help very much. I know with your help I can do this. I'm hoping it will be a fun and satisfying to do this myself.

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CNKS

07-06-2007 18:56:48




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 Re: picklex, epoxy in reply to Big Hunter, 07-06-2007 18:23:52  
I have done it with no problems, but I do not recommend Picklex or any other phosphoric acid product on cast, I have stopped using it for that purpose. The possibility is that it will lift the paint because you can't get it out of the pores of the cast. Sandblast it (SEE BELOW), use wax and grease remover, and prime it with epoxy. Most epoxies have a time limit on topcoating, it may range from 2 days to about a week, follow the instructions on the spec sheet. Same goes for the epoxy, as to the number of coats. PPG MP 170 epoxy requires two coats. Hardener must be used with epoxy or it will not cure. Most not all hardeners or catalysts used in epoxy do not contain isocyanates meaning you can get by with a charcoal mask. READ THE MSDS. If you use hardener in any other product you should use supplied air as iso's can cause severe health problems. Back to your washing question. If you use water you MUST dry it off immediately or you will get flash rust. Wax and grease remover does not result in rust. After all that, you could not pay me to sandblast a block or anything else that you might get sand inside of. Use a wire brush on an angle grinder or electric drill. Others can disagree if they wish. Picklex is fine on sheet metal and can/should be used as a rust preventative if it sits for more than a few hours in most climates. In western Kansas and other western areas it is not necessary because of the dry climate. Remove all the white residue you can with a scotchbrite pad, then use wax and grease remover. Then epoxy. Use body filler and sandable surfacer on the sheet metal as required.

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