That got your attention! I talked myself into painting my RD350 cylinders before assembling the top end...and then looked at them closely. They're going to be awful to media blast with all the deep crevices between fins and such. Is there a better, perhaps chemical way to strip these things prior to painting? :umm:
Soak it in cider....
Always works for me.... :celebrate:
But seriously....run it through an acid tank, like a machine shop does for engine blocks.
Just make sure they only run it through for a short time or it will disappear
Disappear!? Holy trust the machine shop, Batman!
The "goods" in strippers is (was) MEK, which, in the US, was banned for consumer sale two years ago. If you can find any old product in your shed etc, use that. The new formulas generally suck.
At places like Sherwin Williams they have strippers that say "Commercial Sale Only" but they don't have the power of good old MEK...
MEK is the active ingredient, not a brand name, right?
Quote from: 85RZwade on December 12, 2021, 08:55:47 PM
MEK is the active ingredient, not a brand name, right?
Right.
I used a soda blaster on a set and it worked well. I did not blast to 100% clan aluminum, just enough to do a good cleanup so that the new paint would stick well.
Is aluminum oxide too aggressive for this?
mek is methyl ethyl ketone. i used to use it at work when fitting grey 'plastic' mains water pipes. wipe the pipes and fittings with mek to completely clean them before applying the glue. still got a litre bottle in the shed :whistle:
cheers, gil.
#80 glass beads is what I use.
In the long run elbow grease must be used.
Quote from: Kawtriplefreak on December 13, 2021, 09:42:33 AM
#80 glass beads is what I use.
^ this. just my .02
but, if you want to just clean up, use rifle barrel brushes and lots of brake clean to get in there to prep for paint. might be ok.
This is what I used on my 1973 RD250 project.
Aircraft stripper. The can on the left was the good stuff.
Found the last can in Ca. I think. The non-Methylene on the
right took twice, or more, as long to soften up the paint.
Then is was to the blast cabinet with glass beads.
Lots of elbow grease and a full box of patients. Came out great.
Not sure if my picture attachment will work. Might be too large.
Lots of work, but, worth it in the long run.
Jeff
Quote from: pidjones on December 13, 2021, 09:47:31 AM
In the long run elbow grease must be used.
Exactly what I feared! My impatient inner sloth is thinking they look fine, but I'll (hopefully) never have a better opportunity to make them look good. Dammit, Sparky!
hit em with engine degreaser, throw em in the dishwasher, expect divorce papers.
Blast 'em.
I had my vapor blast guys here in Portland use dry beads on my LC cylinders and they turned out perfect.
I had mine blasted years ago, I don't recall the media but it was harsh. Took lots of polishing to get back the finish.
(https://i.ibb.co/p0g7DWc/3-F96-CF92-10-EE-41-AC-9740-17-B315-B62-BD9.webp)
(https://i.ibb.co/YX7mH5F/8-D3-E294-D-0-D8-B-4789-B499-6-D1-B4-EFB09-D0.webp)
(https://i.ibb.co/gzwpgQM/E233-BB32-30-A2-4-C5-E-A7-CF-4740279-D78-DC.webp)
Quote from: m in sc on December 13, 2021, 04:36:59 PM
hit em with engine degreaser, throw em in the dishwasher, expect divorce papers.
Or pressure wash in yard and save marriage.
i bought a ts250 engine that was plastered in black paint. stripped it down and took it to my local aquablaster. he told me he's have to bead blast it first to get the paint off and then aquablast it. photo's are before and after :cool:
cheers, gil.
ts250 before:
(https://i.postimg.cc/LhdHGqRq/ts250.jpg) (https://postimages.org/)
and after:
(https://i.postimg.cc/VLjrmwTy/ts250x2.jpg) (https://postimages.org/)
I used glass beads in my blast cabinet...
I do have an extra, old dishwasher in the barn that I've thought of turning into a parts washer. :busey:
When I restored my BMW R100RS, I rubbed Dawn dishwashing detergent on parts and ran them through the dishwasher. They came out a lot cleaner, but the foam went everywhere, even pushed it's way past the door seal during the wash cycle...
wayyyy back i used to use oven cleaner and a coin car wash. just rinse the hell out of it and oil the jugs immediately.
If the cylinders need to be bored I sand blast them first. Our blaster has aluminum oxide in it, works great, just be careful around the gasket surface.
These cylinders are bored and ready to be assembled, so I don't want to F that up. Have access to a 3000 psi hot water pressure washer with a rotary nozzle at work, and I know where to get easy-off. Compressed air, oil the boss immediately and a rinse with some surface prep before high-temp black sound like a plan?
yup. be dilligent w the bores.
The un used turkey cooker filled with water and dishwashing detergent. :toot: