Issue with Phosphate Treatment of Engine Hardware

[7E-Bodies]

I watched the video by @Cuda Cody on treating my black phosphate hardware parts, bought the same solution and was amazed at the results. Going by the cashy but valuable MMC fasteners manual, I made sure of which items required phosphate finish and that they were correctly marked. The results were quite impressive. That was several weeks back. Yesterday I noticed that some (though not all) were showing a frosting of rust/oxidation. Did I do something wrong? Has anyone dealt with this or perhaps came up with a remedy?

[anlauto]

I've never found a home kit that had any longevity ...did you clear coat them or oil them after the process ? I know Eastwood's kit used to require a clear coat after.... I believe

[7E-Bodies]

Excellent points. I did indeed oil them, but didn't exactly leave them dripping. A fair film I'd say. Wondering if the factory ones frosted over this quickly.

[chris NOS]

you can treat them with Boeshield T9 , it works good to protect bare aluminium,magnesium ect ,...

[7212Mopar]

I found the RPM Rust Prevention Magic works really good to keep rust away.

[moparroy]

Phosphate treatment is porous - it will not stop rust. Oil on top provides a sealant but oil won't last esp under heat. Hence a heat resistant clear coat would be better. I'll give RPM a try - that sounds like an interesting option. I have used rust check but don't have any in service experience with it yet - don't expect it to last long term without repeat treatment of some kind.

[Gary AAR]

I second the use of RPM (Rust Prevention Magic).  I do the phosphate finish, dry the parts, and then apply the RPM.  No signs of any rust, with some of the hardware having been treated well over a year ago.

[BIGSHCLUNK]

I had the same experience w EASTWOOD'S kit years ago. Things just didn't hold up long at all.Shoulda coated them after... but what did I know......... 

[7212Mopar]

RPM is available on Amazon in 4oz or 8oz can. I used it in suspension parts, bolts, axle flanges, fuel and brake lines etc. no rust.

[anlauto]

I had the same experience w EASTWOOD'S kit years ago. Things just didn't hold up long at all.Shoulda coated them after... but what did I know......... 

I hit the same level of disappointment 

[Mrbill426]

Time will tell of course but I used POR15 Metal Ready (now Metal Prep I guess) and used their instructions; so far so good.  I think it depends too on the type and make-up of the metal and how it is "preped" for the treatment.