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Painting inside of outdrive?

theydrewa31

Regular Contributor
This is a simple one, and probably a lot of opinion involved here and for that reason I will take anything, even if it's just your two cents.

I am currently rebuilding my Cobra outdrive and I came across some information from a fella who paints the inside of some areas of his lower units when he rebuilds them. He uses an aluminum appropriate primer and a clear coat on top of that. Nothing crazy, just a simple layer to help with corrosion in water contact areas. Have any of you ever done this or seen it done? I'm just wondering if it is worthwhile or a waste of time and money. Part of me says that if it was truly worthwhile they would have done it at OMC, the other part of me says that manufacturers rarely concern themselves with issues that won't be of concern until well after the warranty period.

Not sure that it matters, but the boat was previously on freshwater and had little to no corrosion inside the lower unit, and will be used primarily in saltwater moving forward. I hear that the outdrives used on saltwater seem to have more issues with the corrosion?

I'm not looking forward to adding more work to the project so I'd like to skip anything that isn't truly necessary, that said I don't want to shortchange myself while I have access to the inside of the outdrive. I also don't want to do something stupid and paint something that should never have been painted. Not sure it matters but one of the areas I would most likely paint is the area where the propeller shaft and lower bearing carrier are housed as I hear those bearing carriers are prone to getting stuck in the lower gear housing.

What say you Gents!? Paint or no paint?

Thanks in advance for any help Gents!
 
I have done it but that’s because in my use moored in salt water you will get marine growth in the water intake area and that does eventually cause low raw water flow & mild overheating. Beyond that it depends on how bad alu corrosion is where you are located….
 
Ayuh,.... A complete waste of effort,....
Thanks Bondo! I was kind of thinking it wasn't necessary. I am also not really looking forward to painting the inside as I already painted the outside and don't want to run the risk of messing up the nice exterior paint I just did.
 
I have done it but that’s because in my use moored in salt water you will get marine growth in the water intake area and that does eventually cause low raw water flow & mild overheating. Beyond that it depends on how bad alu corrosion is where you are located….

Not a bad idea for the water intake. That was one of the areas I was worried about. I won't be mooring this boat. At most she will spend one or maybe two nights on the water but most likely just one night at a time.

As far as aluminum corrosion in my area, I have no idea. My family has had lots of boats, all outboards that were used in the same area I will be using this boat, but we never opened them up to know what corrosion was like on the inside. If anyone else can share some experience on that I am all ears!

Thanks again Louc!
 
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