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Re: Phosphoric acid vs. Muriatic acid?
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Posted by Clooney on January 12, 2002 at 08:32:38 from (172.138.114.191):
In Reply to: Phosphoric acid vs. Muriatic acid? posted by Tom on January 12, 2002 at 07:43:28:
~Tom, muriatic acid eats both rust & good metal & makes the treated metal rust even more. In many cases will even pit the metal more than it already is & can destroy good parts.
~phosphoric acid attacks only the rust & won't bother most paint or good metal, it actually converts rust to a phosphate & promotes paint adhesion, it goes into the metal pores to kill the rust that is missed by sand blasting & wire brushing.
~The main drawback of phosphoric acid is it won't remove thick rust, grease or paint, so should be used as a follow up to other rust removal procedures like sand blasting, wire brushing etc.
~As for cost, I buy mine by the case & haven't bough it in a while so can't give you a firm price but I believe around $25.00 a gallon. A gallon will go a long ways if just used for a final rust killer & treatment before painting. If you do decide to try it, get the spray bottle they also sell as it allows you to spray it on evenly & actually uses less that way.
~Anybody else that is using a phosphoric acid product from a different company, I would like to hear their opinion on that product. I have had good results with the product I'm using now & am reluctant to change just to try a different product. I'm sure there are others out there using a different supplier of phosphoric acid with different additives in it that have been getting good results also & if I would like to know what brand is being used & how long they have been using it.
~Phosphoric acid is the main ingredient used in "Metal Prep" & other etching primers that is used by many painters to promote paint adhesion on older metal & bare exposed metal that has a tarnish to it.
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