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CNKS
08-08-2006 14:47:09
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Re: Painting over pitted metal in reply to Steve-Maine, 08-08-2006 02:45:51
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Since you have vibration, use a Bondo type two part filler. I reserve the metal glaze type products for shallow pits, and I would consider them less durable than the bondo types, but I have no proof of that. Some people prefer to use bondo-type products over epoxy primer, mainly as a rust prevention step, but it is really designed to use over bare metal. And, I have never used Bondo on high vibration surfaces either. It will take a lot of sanding, I don't know how big your unit is. On small areas I sometimes use JB weld and smooth it out with body filler, JB is very hard to sand but it works. Sprayable filler is ok, I have never used it, it will take 2.0+ mm tip to work right, and I sure wouldn't use it in my topcoat gun. Surfacer, regardless of the brand will not fill deep pits, unless you use many applications. As Brad stated cover it with epoxy primer, a cheaper PPG version is PPG Omni MP 170. Less than half the cost of the DP ones. Only significant disadvantage I know of is the 3 day topcoat window, as opposed to 7 day for the DP series, that has never been a problem for me. You do not need any etching products, since you will sandblast it.
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