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Old 05-28-2014, 01:47 PM   #1
flemsmith OP
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Joined: Apr 2006
Location: Apache Junction, Az
Oddometer: 483
Glyptal inside water pump..?

I have a cistern pump that's used infrequently, and has rusted solid in the past. It's a cast iron housing that rusts the plastic pump impellers so the motor can't even turn them. When I rebuild it, I was thinking of coating the inside with glyptal in an effort to keep it from rusting.

Anyone have experience with a similar problem and can give me advice?

Thanks in advance,

roy
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Old 05-28-2014, 01:53 PM   #2
gsweave
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Quote:
Originally Posted by flemsmith View Post
I have a cistern pump that's used infrequently, and has rusted solid in the past. It's a cast iron housing that rusts the plastic pump impellers so the motor can't even turn them. When I rebuild it, I was thinking of coating the inside with glyptal in an effort to keep it from rusting.

Anyone have experience with a similar problem and can give me advice?

Thanks in advance,

roy

Glyptal sould be just fine for your purpose.

If the cistern isn't for potable water. A light coat of grease once a year will also help.

Personally, I would just run the pump once a week
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Old 05-30-2014, 06:45 PM   #3
ThorRex
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Glyptal is generally used as an electrical insulator….painting motor windings and such…it'll work, but why not use epoxy such as WEST system or System Three….it's marine grade stuff, a little pricey, but it comes in many different size containers to ease the cost. It'll hold up way better than a polyester resin
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Old 05-30-2014, 10:57 PM   #4
GreaseMonkey
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Quote:
Originally Posted by gsweave View Post


Personally, I would just run the pump once a week
I agree with what gsweave says here. Just a little running every now and then is the best way to keep motors freed up. I'd look into something like this $20 seven day timer where you could set it to run for 5 minutes or so once a week:

http://www.radioshack.com/product/in...gABg&gclsrc=ds
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Old 05-31-2014, 05:46 PM   #5
lnewqban
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Location: Florida
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Quote:
Originally Posted by flemsmith View Post
I have a cistern pump that's used infrequently, and has rusted solid in the past. It's a cast iron housing that rusts the plastic pump impellers so the motor can't even turn them. When I rebuild it, I was thinking of coating the inside with glyptal in an effort to keep it from rusting.

Anyone have experience with a similar problem and can give me advice?

Thanks in advance,

roy
If you have a brass or copper part close to the cast iron housing, you are seeing and electrolytic corrosion.

If that is true and you cannot remove that brass material, you could install a piece of zinc close to the housing in order to protect it.

Please, read this:
http://en.wikipedia.org/wiki/Cathodic_protection

:)
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