Cruisers Forum

Thread Tools Search this Thread Rate Thread Display Modes
Old 17-10-2020, 10:37   #1
Registered User

Join Date: May 2018
Location: Vancouver Island
Boat: Grampian 26
Posts: 42
Outboard Corrosion - Painting?

Our sailboat, in a salt environment, has a older Yamaha 8hp long shaft.
The outboard has always been 100% reliable and overall looks quite presentable however there is an area of the aluminum exterior lower engine casting that has developed some corrosion.

It seems that the factory paint barrier has been breached allowing moisture, in the absents of oxygen, to form a white powdery oxide and further undermine the paint.
Last haul out I did a clean up of the area with a brass brush, emery cloth and a wipe down with acetone and a quick spray with a rattle can from HD.
This has lasted a while but I see the problem is coming back.

Is there a better process/paint that will allow me to touch up the engine or would it be better to just remove the flaking paint a ignore the cosmetics?
Calaban-Alleria is offline   Reply With Quote
Old 17-10-2020, 11:30   #2
a64pilot's Avatar

Cruisers Forum Supporter

Join Date: Oct 2013
Location: Jacksonville/ out cruising
Boat: Island Packet 38
Posts: 31,473
Re: Outboard Corrosion - Painting?

There are better processes, but it may not be worth the pain.
Start by cleaning and alodining the aluminum, then proceed to an Epoxy propolymide primer and then a two part Epoxy based paint.
Paint on aluminum, especially in salt water is a temporary thing, my opinion is over time any coating over aluminum will fail, done exceptionally well it may last years though.
a64pilot is offline   Reply With Quote

corrosion, outboard, paint

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Stray- Current Corrosion, or Galvanic Corrosion, or?????...Help sailcrazy Electrical: Batteries, Generators & Solar 46 25-03-2019 21:35
Outboard Engine Corrosion in a Well Capt.Fred General Sailing Forum 1 02-11-2011 16:45
Honda 4 Stroke Outboard Corrosion Problems doocruiser Engines and Propulsion Systems 0 21-11-2010 07:26
Mercury outboard book? Or just outboard? Jack Long The Library 2 17-09-2008 08:33

Advertise Here

All times are GMT -7. The time now is 00:42.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2021, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2021, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.