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Leave it alone. Obviously you don't know what you are doing by asking that question. You will screw it up more than you help it.

Don't mean to sound s^&*&tty but it's true.

Ken
 

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imo all that can really be done is sharpen the leading edge on the vanes.

anything else is snake oil imo.you can spray speed coat,go as far down in the vanes and polish all you like.the end result is the same.good luck.
 

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Crap I was gonna spray bed liner in mine to break up the surface tension.
good point,lol!!

i have found it very interesting that one would do a ton of work to a bowl.

i have speed coated a few bowls and stuck them back on with no change in mph,maybe e.t.???not much if any.

i have also polished the vanes as far as i could go front and back,same results and its not rocket science to do this.still no change.

the best thing i have found like alot of others is knife edge the leading edges and go for it.;)

spend the rest of your time setting the pump up properly and detailing the impeller is most important in my book.
 
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