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Franz
11-09-2001 22:01:52
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Re: Re: Re: PHOSPHORIC ACID in reply to Lewis, 11-09-2001 18:11:02
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Skotchbrite is a plastic version of steel wool, made by 3M. It's available from body supply houses, and is also used for scouring pots & Pans.
It comes in many varietys and grades of abrasiveness. While I'm on the subject of Skotchbrite, it's also great for scuffing dead paint from old machinery, as long as you use water along with it to keep flushing the area being worked, to prevent loading.
The phosphating process, usually leaves you with an uneven surphace, akin to the skin of an orange, with small nodules where there were rust pits, sort of like trunk paint on the inside of a car trunk. If you want the finish to look smooth, use skotchbrite, or sand lightly. The skotchbrite, in this case, is not being used to roughen the surphace, but rather to smooth it out and even it. In my experience, Skotchbrite works best and easiest on the stuff we deal with.
You do NOT have to prime over the iron phosphate, if you have a complete coating, no bare metal showing. Primers are used to provide a good bond between bare metal and enamel. Iron phosphate doesn't require an additional primer, it is one.
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