Cruisers Forum

Join CruisersForum Today

Thread Tools Rate Thread Display Modes
Old 27-02-2014, 18:31   #16
Registered User
leftbrainstuff's Avatar

Join Date: May 2011
Location: San Francisco and Australia
Boat: Liberty 458
Posts: 1,597
Re: Engine painting fail

Originally Posted by minaret View Post
No primer? No acid etch? Doomed to failure. Can't paint cold metal either. Must be dry and warm. Primer must be applied within 45 minutes of abrasion and final cleaning. Blow all that paint off with a pressure washer and start over.
+1 to minaret's advice.

If you're stuck with painting in situ the key is to ensure all rust, dirt and oil is removed. With an acid or caustic cleaned block this is pretty straight forward. MEK or Toluene always worked well. You can tell if its clean by wiping with a white cloth. Any dirt will lift the paint.

A good high gloss enamel always works well. Most engines have quite rough castings and some porosity so enamel laid on thick is the key.

Sent from my GT-I9300 using Cruisers Sailing Forum mobile app

leftbrainstuff is offline   Reply With Quote
Old 27-02-2014, 18:36   #17
Registered User

Join Date: Feb 2014
Posts: 29
Re: Engine painting fail

Certainly use an air dryer when spraying paint, but I'd be surprised if just dusting it caused rust. Cold block, humid environment.. like a sealed boat with a person breathing in winter maybe?

TDC is offline   Reply With Quote
Old 27-02-2014, 18:59   #18
Registered User
d design's Avatar

Join Date: Oct 2013
Location: Whangaroa, New Zealand
Posts: 237
Is there any sort of oil or something i can use to prevent any more rust during winter? winter is about 17c here
d design is offline   Reply With Quote
Old 03-03-2014, 12:34   #19
Registered User

Join Date: Mar 2014
Posts: 5
Re: Engine painting fail

I wouldn't be worried about the rust being removed as I would be worried about it being dried and converted. Here's what's worked for me:

-I clean it thoroughly with a heavy degreaser, like purple power or simple green letting it soak a little bit
-wash it off
-Dry the block with acetone and a rag
-Then I remove the loose pieces of rust with a wirewheel or whatever you have that you can get in the small areas, a screw driver ect
-Clean it with acetone and a rag again
-Convert the rust with Ospho. Sometimes it will take more than one round
-Paint it with a good rust paint like POR-15
-Top coat it with whatever you want

Watch your metallurgy and avoid hitting non ferrous metals with corrosive products like the ospho.

Cast Iron is very porous and takes some convincing to get the oil off of the surface sometimes. A good paint job is all in the prep work and with you ending up with creaky worn out joints.
Mikerodrig27 is offline   Reply With Quote
Old 03-03-2014, 12:58   #20
Marine Service Provider
boatpoker's Avatar

Join Date: Nov 2008
Location: Toronto
Boat: Benford 38 Fantail Cruiser
Posts: 1,653
Re: Engine painting fail

Tremclad (canada), Rustoleum (us) rust paint. No primer, 16yrs, no fail.
Cheapest paint you can buy.
Attached Thumbnails
Click image for larger version

Name:	ENGINE 1.jpg
Views:	62
Size:	210.3 KB
ID:	77067  
Be the man Sharon thinks I am - wg
I can do that - wg
If you're not laughing, you're not doing it right. - wg
boatpoker is offline   Reply With Quote
Old 03-03-2014, 13:10   #21
Senior Cruiser
roverhi's Avatar

Cruisers Forum Supporter

Join Date: Aug 2005
Location: Kona, Hawaii
Boat: 1969 Pearson 35 #108
Posts: 5,452
Send a message via Yahoo to roverhi
Re: Engine painting fail

Spray it with Ospho or other metal prep, let dry and paint. Will work as long as there is no flaking rust. POR 15 makes a great engine paint that goes on over rusty engines as prepared above. Painted the Series Land Rover engine 15 years ago and it still looks great in our salty environment.

Peter O.
'Ae'a Pearson 35
roverhi is offline   Reply With Quote

Thread Tools
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

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities

Copyright 2002-2015 Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 08:01.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.