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Originally Posted by sdold
When you guys use Ospho, do you spray it on and let it dry? If so, how do you prevent the thick crud that accumulates at the bottom of the part?
Or do you let the Ospho sit for a while, then rinse?
I tried the second method once and seemed to get a thin layer of rust when it dried.
Steve
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Steve,
Any conversion coating/cleaner/prep solution will give you that lovely chrystilin munge where the drips collect. What you are seeing is the corrosion/dirt/whatever that is actually being converted. That is the exact reason why I wipe it on instead of spraying. Most of these products when used in powder coating are sprayed on then sent through a dryer, to avoid that happening. It really doesn't take alot of material to create the surface conversion, so I no longer spray. I use a lint free rag soaked with picklex and just wipe the part down. It does take some extra time when I'm doing a frame or a really intricate piece but it beats having to deal with that rock hard junk on the workpiece. When I first started my shop I built a heated phosphate dip tank, It worked very well, but was a little unweildy and not big enough for some of the parts I coat, so I dismantled it. I actually prefer the picklex "wipe-on" method anyway. It allows me to more closely examine the parts. I actually found a dangerous crack in a customers dirtbike frame while I was pickling it. I ended up finding a couple more and making an extra $100 on the job, because I made the repairs in shop.