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I’ve had good luck with Aluminum by scuffing the surface, then using etching primer, (The silvery- green type.) About any paint will stick.

I’ve tried a lot of those! I think I like the yellow zinc phosphate primer from Seymour

This is literally the best “how to” video on TH-cam! STRAIGHT to the point, extremely clear information Without rambling on for 20 minutes! Now, if you could just post some grwm how to make up videos, that would be great 🤣 lol

"How does a channel with the word "Engineering" in it not know that without etching the aluminium first, no paint or primer is going to stick?

Very cool thank you

Thanks great information. For parts where its not affordable to anodize, I have been using the chem-film coating. For small quanity use I found 1 gallon jugs of it intented for air-craft use. Can you compire primer-paint to chem-film?

Great video!!!

Thank you for taking the time, and spending the money to do this video!

skipped the 285 previous comments, so here is my assumption on the black you are getting from tumbling....it is the dish detergent which is an Alkali causing it, as aluminum is dissolved with an alkali......have you found out yet......what actually cause the discoloration. I have tumbled a lot of aluminum, with both plastic, ceramic and walnut shell.....never saw any discoloration like you are getting, Best wishes Paul in Orlando, FL

Useful info

By not putting anything on top of the primer, you've changed the experiment from testing how well primer sticks to the surface to how well it sticks and how good it is if used as a *paint*. Experiment would be cleaner if you'd apply a coat of epoxy paint on top of the primer.

I have an aluminum post covering a wood post on my concrete screened porch at the base. Would I scrape off the rusted aluminum part before I treat it with something like Rust Reformer?

Is the control-knob a golf ball?

its as much as the freakin saw.......no no no

This was really exciting until I realized the price of this mod is the same cost as the saw. The whole point in buying one of these saw is to save money in the first place so I don’t see how it could be justified. Maybe at like $100 but definitely not $300

I think with aluminum you have to get rid of the hard oxidation scale for the acid in self etching to do anything. The catch is now you've already roughed up the surface so normal primer will also work. At the end of the day, self etching is only worth it for extreme corrosion or abrasion applications, then it's usually combined with a zinc compound, and you still need to abrade the surface first.

Thanks for sharing 👍

The “patina” is oxide from the detergent and water Alodine first, then use a zinc cromate primer.

❤

Zinc chromate primer. This has been well known for almost 100 years. It's sold by most boat dealers or marine supply stores and on Amazon.

I was told by the guy that owns my local Ace Hardware that their primer is literally Krylon relabeled 🤔

Thanks for what you've done 5 years ago for us

Thanks, I wish I saw this before today. Just used Dynaseal to coat the inside of my aluminum hitch toolbox to keep my tools from getting aluminum all over them. I already had the dynaseal, so sanded with 220 and laid it on. If it doesn't stay ill try the ACE. 👍

Great job. Excellent analysis. Surprising outcome. Thanks for the helpful vid.

Thank you!

Lost me at Harbor Freight

Very informational video, thanks.

I believe it is pronounced PATINA with a P, and it comes from the oxidization of aluminum due to the cavitation of the water on the surface of the aluminum. Same thing happens to aluminum trailers, boats etc. Excellent video, thank you!

Good job

every modern airplane is aluminum and is painted we've been doing this for a century. get an AC 4313-B manual and follow that method. Clean, degrease, acid etch, wash, alodyne, wash, DTM epoxy primer , top coat , clear coat if its a base/clear.

Just received mine yesterday and I mounted it today. It works amazing Andy and what a huge difference it makes!

great idea but the saw didnt cost me but 199 so 299 just for a hydraulic cylinder seems high for my pocket book but your execution and fix is spot on and i bet it makes a huge difference . if i used mine more than 2 or 3 times a year i would empty out my pocket book

It's interesting that the painted ones didn't pick up any of the "patina" in the machine.

Good review, thanks.

thank you

That black-ish patina on your aluminum stock is probably due to silicon, copper, etc. contaminants in the aluminum mix oxidizing after the vibratory media has removed a lot of the base aluminum stock. The various "grades" of aluminum have various amounts of contaminants in them depending on the type. For example 1xxx is almost pure aluminum, and the amount of contaminants goes up with each grade designation, e.g. 1xxx has the least and 7xxx has the most. Your stock is 6xxx so it has quite a bit of other stuff in the mix.

painted aircraft and missles for the USAF for several years. Used zinc cromate primer on all aluminum to prevent the blackening which is corrosion. Not sure that primer is even available now because of its composition.

Search "Dan Gelbart" he shows how you test for NO water beading before applying coatings. Done with comet and a scrub pad.

Reasonable test, surprising results, just the kind of thing I like to see.

What you need for aluminum is the green zinc chromate or zinc phosphate primer as used on aircraft. Wouldn't surprise me if it was mandated in aircraft manufacture.

The extruded wasn't scuffed. Try that sometime and see if it comes up better.

I always remember Xylene paint would stick to metal roofing.

Upon exposure to the air, bare aluminum develops a thin layer of natural oxide. This patina layer is thin, transparent, tough, and protects the aluminum from corrosion. From GSA (General Services Administration).

Thanks for this! I’m using the 1” square aluminum tubing for a project on the outside of my house, so it must be painted. I can’t tumble it but I can surely sand it. Then acetone. Then Ace primer. Then topcoat (colormatched Rustoleum in a can.) Yes?

Maybe I missed it...if you did not sand/prep the aluminum no paint will stick. I apologize if you did sand them but I did not see or hear that you did. I am about to custom paint an aluminum baseball bat for a guy. Prep is a must

Ace wins? That surprizes me. 👍

Thank you for answering what I needed to know. God bless

I've always passed by #AceHardware 's primers & paints thinking they would be lesser quality. I think I'll stop doing that. :) Great video! Thanks!

Hi Andy, I purchased this kit not quite 2 years ago and have struggled to get it to stop leaking out of the T fitting where the tube leaves the fitting and goes into the speed valve. I have had this leak since installing it in the fall of 2021. I have replaced the T valve and tubing but it continues to leak. Any help would be appreciated. I am almost to the point of wanting to try and replace the plastic push fittings with compression fittings but have no idea what to buy. In all transparency, the kit is great but I think the plastic fittings and tubing don't hold up well in my garage in Phoenix where the temps get up past 120º since I don't have it air conditioned.

So, looks like there's no solution to painting old screen doors and windows 😢