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Post by ChrisJ on Jan 5, 2021 18:56:36 GMT
Hi all,
I'm getting ready to strip and paint a CK and I'm looking into what options I have for removing the original paint.
I sand blasted my 1933 CK using play sand but I'd rather a smoother finish this time around. I've heard baking soda made for blasting will work good but I'm concerned about it not being aggressive enough to remove the original paint as it seems awfully hard and bonded well.
I'm also concerned about how well it will work with our pressurized blaster made for sand.
And finally, if I were to do soda blasting, would 50 pounds be enough?
All thoughts and opinions are welcome!
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Post by turbokinetic on Jan 5, 2021 22:15:35 GMT
Hi Chris. I'll be interested to hear how this goes! I've never done blasting other than glass bead blasting of small parts in a blast cabinet.
I would expect the soda blasting would have a hard time with the paint on a CK. The paint seems to soften when heated by abrasive action which will make the blasting ineffective. But I could be very wrong and will look forward to hearing how it does!
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Post by ChrisJ on Jan 5, 2021 22:33:20 GMT
Hi Chris. I'll be interested to hear how this goes! I've never done blasting other than glass bead blasting of small parts in a blast cabinet. I would expect the soda blasting would have a hard time with the paint on a CK. The paint seems to soften when heated by abrasive action which will make the blasting ineffective. But I could be very wrong and will look forward to hearing how it does! I started to think soda blasting might not work good when a magic eraser didn't seem to do much to it. The play sand did ok on the CA but there is a slight texture to the condenser I wish it didn't have. Maybe I needed to do more prep work and use sandable primer? |
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Post by coldspaces on Jan 8, 2021 16:46:20 GMT
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Post by ChrisJ on Jan 8, 2021 17:44:56 GMT
Don't forget, I'm blasting a CK so it has a plate condenser. I'm getting my media from McMaster and they have a pretty big selection. When I blasted my CA with play sand it seemed like it left a slight rough finish on everything, not terrible, but it's there. On the flat surfaces like the box top the paint smoothed it out but it seems still noticeable on vertical areas. This may be primarily my fault for not using a sandable primer and spending more time on prep? I don't know. I'm still learning. I need to also figure out what paint to use because I didn't care for the "Appliance epoxy". It's fine now after many years but it was really soft for a long time. |
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Post by coldspaces on Jan 8, 2021 18:03:08 GMT
That's right, the plate condenser will be much harder than copper and should do fine.
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Post by elec573 on Jan 15, 2021 4:45:47 GMT
Interesting conversation, I picked up a pot sand blaster for 25 $ but of corse it needs some work . All ready have a very nice 7.5 hp 80 gal air compressor. I’m was wondering about sandblasting my fridges in prep
of painting. So same questions I was figuring on soda blasting anything more delicate like copper (dr)
But would like input from anyone that has done sand blasting.
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Post by Travis on Jan 15, 2021 14:59:35 GMT
If I recall, the guy that helped with my DR3 used soda on the dome and sand on the deck. We were concerned about the copper coils.
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Post by ckfan on Jan 15, 2021 20:44:56 GMT
When I had my DR1 blasted they used media all over it. I think it was some sort of plastic bits and pieces. I’ve also heard walnut shells work good.
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Post by elec573 on Jan 17, 2021 6:00:47 GMT
Thanks for your reply, my self I was thinking soda for dr copper .
sand or something similar for cabinet. But there are so many abrasives would like to here what works ?
But this is not my thread !
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Post by ChrisJ on Jan 17, 2021 18:25:09 GMT
Thanks for your reply, my self I was thinking soda for dr copper . sand or something similar for cabinet. But there are so many abrasives would like to here what works ? But this is not my thread ! Oh no, feel free to use the thread. I want all the info I can get. |
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Post by ChrisJ on Jan 20, 2021 16:30:32 GMT
So,
The only big thing I've found about soda blasting is it will leave a film that needs to be washed off, typically with water.
Apparently it can be soda blasted and then left for a while without a fear of rust forming, and then washed off, cleaned good and primed.
I'm just not sure how I feel about hosing down a CK machine and that sounds like what needs to be done to get to the fins etc. I guess it shouldn't matter if the relay and control and insulation is removed anyway. Just make sure to get it good and dry after washing.
I figure, pull the control and relay off, protect the bottom side of things with paper or cardboard, soda blast. Then when I'm ready, pull the bottom apart, pull the insulation and old wire out and wash all of the soda off with water and prime. After priming, rewire it, new insulation, clean/sand the primer and any touchup that's needed followed by the top coat.
Thoughts? Opinions?
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Post by elec573 on Jan 21, 2021 2:09:29 GMT
I know Ray had his dr soda blasted maybe he can ask the people who did his how they handled it. Another option I think is to get in touch with a body shop they do sand blasting
on cars .
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Post by turbokinetic on Jan 22, 2021 4:43:38 GMT
So, The only big thing I've found about soda blasting is it will leave a film that needs to be washed off, typically with water. Apparently it can be soda blasted and then left for a while without a fear of rust forming, and then washed off, cleaned good and primed. I'm just not sure how I feel about hosing down a CK machine and that sounds like what needs to be done to get to the fins etc. I guess it shouldn't matter if the relay and control and insulation is removed anyway. Just make sure to get it good and dry after washing. I figure, pull the control and relay off, protect the bottom side of things with paper or cardboard, soda blast. Then when I'm ready, pull the bottom apart, pull the insulation and old wire out and wash all of the soda off with water and prime. After priming, rewire it, new insulation, clean/sand the primer and any touchup that's needed followed by the top coat. Thoughts? Opinions? Hi Chris. That sounds like a good plan! You will need to get the soda residue off after blasting it in that manner. As you said, if the control and relay and wiring are removed; and the cardboard surround and insulation is removed - there's nothing water won't hurt. I wouldn't blast the evaporator unless you want it to have a different texture to it once done. Probably do all the blast and paint work, then re-assemble with "white gloves" so to speak. |
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Nickie
New Member
Posts: 10
Location: Detroit
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Post by Nickie on Mar 21, 2021 14:05:04 GMT
I have a CK-35 and I've done a few test patches using chemical strippers. I used some citristrip from the hardware store covered in wax paper and it took off 2 layers of paint very easily. I'll probably strip everything doing it this way.
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