CLR and outdrives

missalot

Seaman Apprentice
Joined
Sep 19, 2009
Messages
39
I have a couple of mercruiser outdrives that have been neglected in saltwater. Has anyone used CLR or other calcuim removing cleaner to clean the marine growth off? (I have used muratic acid on bronze propellers with good results) I would would rather dissolve it if I can rather than mechanically removing it.
A lot of the paint is gone from the parts, so once clean I plan on etching, alodine coating and painting.
 

funk6294

Petty Officer 1st Class
Joined
Apr 26, 2009
Messages
294
Re: CLR and outdrives

What ever you do, DO NOT use muratic acid to clean anything aluminum.
 

dingbat

Supreme Mariner
Joined
Nov 20, 2001
Messages
16,317
Re: CLR and outdrives

Not sure what your expecting the alodine treatment to do. If it where me I'd sand blast the surfaces clean then apply a zinc chromate wash primer. Top coat with 2-3 coats of factory enamel and a coat of clear.
 

LongLine

Chief Petty Officer
Joined
Nov 2, 2008
Messages
494
Re: CLR and outdrives

DO NOT use CLR on aluminum!. Do a search on "CLR aluminum." The directions specifically say "do not use on aluminum."

Tom B.
(LongLine)
 

sickwilly

Lieutenant Junior Grade
Joined
Jul 9, 2007
Messages
1,089
Re: CLR and outdrives

I have used it on my merc outdrive, it was effective. I followed with soap and water.
 

livin4real

Petty Officer 2nd Class
Joined
May 22, 2009
Messages
167
Re: CLR and outdrives

What ever you do, DO NOT use muratic acid to clean anything aluminum.


????? Muriatic Acid is used quite frequently throughout the boating world to clean pontoons. As long as it's diluted and you wear the proper mask it works very well. Many welders also use it to clean aluminum stock before welding, again proper dilution and safety apparel are key.
 

"G"

Petty Officer 2nd Class
Joined
May 2, 2009
Messages
150
Re: CLR and outdrives

I have used EZ off oven cleaner with good result. The trick is to let it sit but not too long. How long? That's the question. Second coats may be needed but a thorough rinse is good advise for any of those acid/lye type cleaners.

This was discovered by spraying the EZ Off on the hull when it was green w/ algae after cleaning off the grass. One time around the boat with the spray, a stiff brush to ruff up the tough spots and then a good rinse. You'll find the spots that need second coats are typically on the drive unit.

A good coat of anti-foul paint after you've got it cleaned and sanded is going to save you a ton of work year after year.
 
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