Orange tinge after metal prep

C

chally71e

Hi all,

Big fan of spi products.

My experience with metal prep/phos acid involves parts that don't matter and rattle can. Had no issues.

I'm aware of the neutralizing steps for phos acid before epoxy, to include various threads and of 13 of the tech manual.

My question though is, regarding the orange tinge after washing. I watched a video on the bonderite product (phos acid and zinc phosphate 2 stage coating). Guy mentioned neutralizing it as specified but he stated the orange tinge after washing, is a zinc coating and no issue.

For those more experienced, is this actually surface rust or what? If it is caused by minerals in water could a guy use a tub of deionized water, or something to reduce that?
 
The orange "tinge" is nothing to worry about. Distilled water as a rinse will help, as will drying with dry air or a leaf blower soon after rinsing. I have tested blasted metal washed with Dawn, left to dry, and sprayed with epoxy. The metal was orange and pretty ugly. I sanded the epoxy back to metal after a few days and the metal was completely clean, not even a hint of orange to be found. This made me feel better about rinsing, along with Shine and Barry assuring me it was not an issue.
 
Thanks!!

Yeah I see that from shine, crash and Barry and that what has gotten me to the 80% let's try it stage haha.

So you are saying you shot right over that orange tinge, sanded back and it was gone? Or the metal looked the same?

Also, anyone ever mess with one of those deionizers for spotless washes? Think that may be a handy way to get di water.
 
For rinsing parts I use hot water. That heats the metal and speeds up the drying time considerably. After a cold water rinse and towel dry, you need to use compressed air
I noticed in the video that he never rinsed his gloves, that can be a source of recontamination.
 
That's a great idea. I'll try it. Just wanted to make sure I was understanding this correctly.

Has anyone tried spi over zinc phosphating coating, ie bonderite or the ppg equivalent 2 stage phos acid/zinc phos system?
 
Back
Top