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In my lifetime of learning from FUBAR blasting a motor with any type of media is a bad idea as it WILL get somewhere it does not belong and something will get ground up 
Back in school in 1973 we sealed up and outboard powerhead and beaded the case and then washed the heck out it in the safety kleen tank
It ran about 7 minutes in the test tank before the next rebuild
I am painting my mast right now and the hardest part is getting all the dust out from the inside so it does not get on the paint as the mast is rotated so you can see well enough to spray a wet coat of paint
Back in school in 1973 we sealed up and outboard powerhead and beaded the case and then washed the heck out it in the safety kleen tank
It ran about 7 minutes in the test tank
before the next rebuild I am painting my mast right now and the hardest part is getting all the dust out from the inside so it does not get on the paint as the mast is rotated so you can see well enough to spray a wet coat of paint
