Anti-rust treatments

[Roy VaughnParticipant @royvaughn26060]

I’m making a Stefan Gotteswinter DTI holder out of mild steel and I would like to give it a surface treatment to inhibit rust.  I’m thinking of something that simply paints on, not WD40 nor treatments like nitriding that Stefan uses.  Is there something out there that’s known to work?  Roy

[Sonic EscapeParticipant @sonicescape38234]

If you polish the holder with Autosol paste it will leave a layer that can prevent rust. I think this is even  mentioned in the instructions. I also use Collinite 476 auto vax on some large milling cutters. But I can’t say how effective it is so far.

Blondihacks has a video with different usefull chemicals and there she mentioned a dedicated rust prevention vax based product. Can’t remember the name.

[bernard towersParticipant @bernardtowers37738]

I use a cold blacking solution and the last process is using a dewatering oil which seems to be absorbed into the blacking (not sure if thats what actually happens) but over the years have not had any trouble rust wise except one piece of my Stent cutter grinder but that could be down to the fact that the grinder is the least oily bit of kit that I own.

[OldironParticipant @oldiron]

I use Phillips Professional Cold Blue on many of the tools I make. Then just a smear of way oil. Not had any go rusty so far.   The trick to good blueing is to make sure the parts to be blued are spotlessly clean and oil free. I soak them in Isopropyl Alcohol for a couple of minutes then use a new wipe to dry them off.  Whatever you use follow the instructions to the letter.

[BazyleParticipant @bazyle]

Don’t let car or furniture polish into your workshop. Apart from pure beeswax they contain silicone which is the enemy of spray painting.

[Sonic EscapeParticipant @sonicescape38234]

You mean that you can’t paint over silicone?

[Sonic Escape]

On Sonic Escape Said:

You mean that you can’t paint over silicone?

Not recommended.  I made the mistake of using some silicone spray for sliding mechanisms in my garage once. A panel I had ready to topcoat was hanging at the other end. When I sprayed it the finish had 100’s of tiny dimples in it. A complete rubdown to the primer was needed to eliminate the problem.  Most paintable  “silicone sealers”  are actually a hybrid polymer sealant.

[BazyleParticipant @bazyle]

I believe the problem stems from the difficulty of  solvents completely removing it and its insulating properties so that little specs of it have an electrostatic field that repels spray paint droplets so you end up with pinholes in the paint surface.

[peak4Participant @peak4]

Whilst I’ve not used it myself, I’ve been told that Renaissance wax works well; there are other “museum waxes” available under different brand names.
https://en.wikipedia.org/wiki/Renaissance_Wax

[Grindstone CowboyParticipant @grindstonecowboy]

+1 on the Renaissance wax, somewhere in the history of the old forums is my post about blueing, as others have said, spotlessly clean (I use general purpose thinners), I warm the parts slightly with a blowlamp which removes all the thinners, into the solution (I use Phillips), agitate with a brush for at least ten minutes, remove, wash in clean water, WD-40 to get rid of water, oil (anything that’s handy, clean engine oil works), leave overnight, wipe off and a coat of the wax.

Rob

[Bazyle]

On Bazyle Said:

Don’t let car or furniture polish into your workshop. Apart from pure beeswax they contain silicone which is the enemy of spray painting.

On Oldiron Said:

I use Phillips Professional Cold Blue on many of the tools I make. Then just a smear of way oil. Not had any go rusty so far.   The trick to good blueing is to make sure the parts to be blued are spotlessly clean and oil free. I soak them in Isopropyl Alcohol for a couple of minutes then use a new wipe to dry them off.  Whatever you use follow the instructions to the letter.

+ 1 for Philips cold blue. Done lots of steel items with no rust on any of them. Need to be spotlessly clean before you start.

Steve.

[bernard towersParticipant @bernardtowers37738]

One thing to be aware of is that the blacking I use does not like steels that contain chromium!!!!

[Roy VaughnParticipant @royvaughn26060]

Thanks everybody for the info, I  will try Cold Blue I think.  Roy

[Gary YeadonParticipant @garyyeadon51936]

Just found your post spray on Molykote may be worth a look.

[bernard towersParticipant @bernardtowers37738]

Just looked up Molykote but corrosion preventatives contain some silicone so a bit of a problem if paint is involved.

[Gary YeadonParticipant @garyyeadon51936]

There are a number ways to apply apply a chrome plating that could be a good solution.

[Roy VaughnParticipant @royvaughn26060]

Something I can paint or rub on is my limit!  Thanks for the suggestion though.

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