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Post  NEW222 on Sun Apr 08, 2018 9:32 am

Hi there. So recently I have started a thread on the poor condition of the backplate on the Bee I bought to restore. Both sandblasting and tumbling came up as options. So, if I was to find my old tumbler, what sort of media would one use best for this application? The two I have in mind were: silica sand, kitty litter. Thanks for your input.
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Post  944_Jim on Sun Apr 08, 2018 10:01 am

Try the kitty litter or garage floor sweep first (very similar stuff).

The rock tumbler is used by auto restore purists that don't want to replace old hardware.

Also look into "micropolishing" the backplate. "Micropolish" is the term used by a guy online that refurbs British carbs (Zenith Strombergs in particular).
The last time I looked, he didn't come off his "recipe" yet. I suspect he was using a vibrating tub with his abrsive media. Some DIY options show an electric orbital sander supported upside down and secured to a plastic tub.
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Post  Oldenginerod on Sun Apr 08, 2018 9:11 pm

944_Jim wrote:Try the kitty litter or garage floor sweep first (very similar stuff).

When loading up the Kitty Litter, just make sure you avoid any lumps. Sh*t Hit The Fan
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Post  rsv1cox on Sun Apr 08, 2018 10:15 pm

Find a friendly garage guy with a sandblaster.  60 seconds later your out the door with a new looking back plate.  Stop by Walmart and buy some Krylon gold, paint exterior only, or polish up a storm.  If you were in the US, a postage stamp would send it to me and I would return a new looking back plate.  

Zenith Strombergs: Media blasted and not.  

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Post  NEW222 on Mon Apr 09, 2018 1:25 am

Oldenginerod wrote:
944_Jim wrote:Try the kitty litter or garage floor sweep first (very similar stuff).

When loading up the Kitty Litter, just make sure you avoid any lumps. Sh*t Hit The Fan

Lol. Now to go clean my monitor.... Thanks for the tip. Very Happy
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Post  NEW222 on Mon Apr 09, 2018 1:43 am

rsv1cox wrote:Find a friendly garage guy with a sandblaster.  60 seconds later your out the door with a new looking back plate.  Stop by Walmart and buy some Krylon gold, paint exterior only, or polish up a storm.   If you were in the US, a postage stamp would send it to me and I would return a new looking back plate.  

Thank you. I do know someone that sandblasts, but, they do industrial sandblasting, and was afraid that there would be nothing left of the backplate using that machine. Shocked

As of last night, I decided to try a couple of things. I put the backplate in a salt and vinegar bath yesterday evening. Just a short while ago I removed it. The vinegar was very dirty looking. I rinsed it off and the white crusty stuff had looked like it disappeared. So, I rinsed it off and dried it with the ol' ladys hair drier. I then just as of 5 minutes ago, put it in my old rock tumbler with some 'kitty media'. So I will now let it run a few hours and see what it then looks like. Thank you.
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Post  Mike1484 on Mon Apr 09, 2018 8:06 am

Sand blast no , glass bead maybe , soda blasting , best choice . Sand blasting leaves a rough finish and can distort metal . Glass beading leaves a finish often seen on European engines . Soda is the best bet if you don't want to change the metal surface to much . Just my opinion and experience . Sand and glass beads can jam up in tiny holes and so cleaning afterwards is a must . Soda dissolves in water , just boil or wash part off .

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Post  roddie on Mon Apr 09, 2018 10:02 am

Mike1484 wrote:Sand blast no , glass bead maybe , soda blasting , best choice . Sand blasting leaves a rough finish and can distort metal . Glass beading leaves a finish often seen on European engines . Soda is the best bet if you don't want to change the metal surface to much . Just my opinion and experience . Sand and glass beads can jam up in tiny holes and so  cleaning afterwards is a must . Soda dissolves in water , just boil or wash part off .

                             Mike1484


Soda-blasting had become a HUGE development in the clean-up of lead-paint. The lead-paint "chips" could be contained in drums.. and flushed of the sodium-bicarbonate blasting-media.. where the previous method included the disposable-weight of non-dissolvable blasting-media.
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Post  Mike1484 on Sun Apr 15, 2018 5:14 am

Just jumped on the Micro Mart site and noticed that they have some small blasters and three different medias to blast with including aluminum oxide , glass beads and ground glass . Since these units are for model makers I would imagine that they would be of use to those who like restoring there engines .I would think that plain old baking soda would also be usable in these blasters . In an older catalog I seen a Pashe unit with a carbide tip with replacement tips . Might be worth getting a extra tip as they will wear out .

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