Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 26-02-2014, 18:03   #1
Registered User
 
d design's Avatar

Join Date: Oct 2013
Location: Whangaroa, New Zealand
Posts: 242
Engine painting fail

Im posting this as a warning.

After removing all rust and paint and getting the engine to bare metal, I decided to use the compressor to blow off any dust. However the compressor did not have a water stop so i was spraying water vapor on the engine without knowing it. Two months later the engine goes rusty. FAIL!

we learn the hard way sometimes.
__________________

__________________
d design is offline   Reply With Quote
Old 26-02-2014, 18:16   #2
Registered User

Join Date: Mar 2013
Location: Annapolis, MD
Boat: Sail any boats from 28 to 60 ft
Posts: 530
Re: Engine painting fail

I don't think it is the water vapor from the compressor. It was the oil mist in the compressor.

Do you use primer and high temp paint?
__________________

__________________
rockDAWG is offline   Reply With Quote
Old 26-02-2014, 18:22   #3
Registered User
 
d design's Avatar

Join Date: Oct 2013
Location: Whangaroa, New Zealand
Posts: 242
No primer just 5 coat of High heat paint.
__________________
d design is offline   Reply With Quote
Old 26-02-2014, 18:27   #4
Senior Cruiser
 
Cheechako's Avatar

Cruisers Forum Supporter

Join Date: Aug 2006
Location: Skagit City, WA
Posts: 19,342
Re: Engine painting fail

Are you saying it was wet before painting? if so , your compressor tank is full of water! Oil is a possiblity as mentioned.hard to say really.
__________________
"I spent most of my money on Booze, Broads and Boats. The rest I wasted" - Elmore Leonard











Cheechako is online now   Reply With Quote
Old 26-02-2014, 18:30   #5
Registered User
 
d design's Avatar

Join Date: Oct 2013
Location: Whangaroa, New Zealand
Posts: 242
VHT paint good for up to 550c. The engine is a Yanmar YSE8 that had been rusty in the botom a boat for years banging away reliably. Bought it for 600 bucks and it runs like a dream. This engine is for my dads 22ft Mullet boat.
__________________
d design is offline   Reply With Quote
Old 26-02-2014, 18:32   #6
Registered User
 
d design's Avatar

Join Date: Oct 2013
Location: Whangaroa, New Zealand
Posts: 242
A local used the same paint without any primer and his engine still looks good after two years.
__________________
d design is offline   Reply With Quote
Old 26-02-2014, 18:54   #7
Registered User
 
SVTatia's Avatar

Join Date: Jul 2007
Location: Toronto, Canada
Boat: Luders 33 - hull 23
Posts: 815
Re: Engine painting fail

Quote:
Originally Posted by d design View Post
Im posting this as a warning.

After removing all rust and paint and getting the engine to bare metal, I decided to use the compressor to blow off any dust. However the compressor did not have a water stop so i was spraying water vapor on the engine without knowing it. Two months later the engine goes rusty. FAIL!

we learn the hard way sometimes.
D, thanks for posting this and sharing the frustration.
Just a thought but the rust is staring perhaps due to other things, such as paint type, etc?
Maybe the engine was not dried enough?
__________________
SVTatia is offline   Reply With Quote
Old 26-02-2014, 19:00   #8
Registered User
 
d design's Avatar

Join Date: Oct 2013
Location: Whangaroa, New Zealand
Posts: 242
I believe moisture was the problem however maybe a primer should have been used? Two months isnt long.
__________________
d design is offline   Reply With Quote
Old 26-02-2014, 19:20   #9
Registered User
 
ozskipper's Avatar

Join Date: Aug 2010
Location: NSW Australia
Boat: Traditional 30
Posts: 1,981
Re: Engine painting fail

Is there water in your bilge? Or other nearby area. Two months sounds more like the engine has been splashed with salt water on some almost regular basis.
__________________
Cheers
Oz
...............
ozskipper is offline   Reply With Quote
Old 26-02-2014, 19:24   #10
Registered User

Join Date: Feb 2014
Posts: 2
Re: Engine painting fail

1. All air compressors should have at least a water trap combined with a regulator. It a safty issue as you can overload you air tools the cheap ones can explode or at least fail. So don't use an air compressor without one. Like the other post side drain the air tank I got 11 bucket from one compressor and I wasn't ever at the place for that job. The bloke bought a air receiver dryer to use with his sensitive equipment and didn't think he needed to drain the air tank. Self main millionaire by the way.
2. We ever I paint an engine I have used high temp paint in a airesole can. Just before I have gone over the block (that is clean) with a propane torch, as you move across the cact iron you can see moisture drying off from the surface. And then while it as still a bit warm I apply the paint, so its warm but not hot enough to burn you or the paint. I have never had a problem. The cast is porous on the outside. Be careful don,t set fire to anything.
3. I would look for a leak or drip maybe. It it generally surface rust all over or just in one area.
__________________
QLDGAV is offline   Reply With Quote
Old 26-02-2014, 19:49   #11
Registered User
 
d design's Avatar

Join Date: Oct 2013
Location: Whangaroa, New Zealand
Posts: 242
Quote:
Originally Posted by QLDGAV View Post
1. All air compressors should have at least a water trap combined with a regulator. It a safty issue as you can overload you air tools the cheap ones can explode or at least fail. So don't use an air compressor without one. Like the other post side drain the air tank I got 11 bucket from one compressor and I wasn't ever at the place for that job. The bloke bought a air receiver dryer to use with his sensitive equipment and didn't think he needed to drain the air tank. Self main millionaire by the way.
2. We ever I paint an engine I have used high temp paint in a airesole can. Just before I have gone over the block (that is clean) with a propane torch, as you move across the cact iron you can see moisture drying off from the surface. And then while it as still a bit warm I apply the paint, so its warm but not hot enough to burn you or the paint. I have never had a problem. The cast is porous on the outside. Be careful don,t set fire to anything.
3. I would look for a leak or drip maybe. It it generally surface rust all over or just in one area.
Thanks. Yeah its its generally surface rust all over.
__________________
d design is offline   Reply With Quote
Old 26-02-2014, 19:53   #12
Registered User
 
d design's Avatar

Join Date: Oct 2013
Location: Whangaroa, New Zealand
Posts: 242
Quote:
Originally Posted by ozskipper View Post
Is there water in your bilge? Or other nearby area. Two months sounds more like the engine has been splashed with salt water on some almost regular basis.
There is a small amoung in bilge from the shaft packing but i dont think it would have splashed on the engine.
__________________
d design is offline   Reply With Quote
Old 27-02-2014, 17:42   #13
Registered User
 
wingless's Avatar

Join Date: Aug 2013
Boat: 2000 Searay 380 Sundancer
Posts: 487
Re: Engine painting fail

Compressing air brings the water vapor along for the ride. The water vapor in compressed will condense to water, with much of it exiting along with the compressed air.

An air dryer is a great choice to keep water from messing up tools and projects. I use a refrigerated air dryer. I never have any problem w/ water in the air.

Before adding the air dryer I would always have water in the air.
__________________
2000 SeaRay 380 Sundancer Mercruiser
454 MAG MPI Horizon 380hp / Westerbeke 7.0KW BCGB
many cool mods
wingless is offline   Reply With Quote
Old 27-02-2014, 18:34   #14
Registered User
 
Reefmagnet's Avatar

Join Date: May 2008
Location: puɐןsuǝǝnb 'ʎɐʞɔɐɯ
Boat: Nantucket Island 33
Posts: 2,734
Re: Engine painting fail

I'm going to go against the grain here. Sounds to me like the motor should have been rinsed with plenty of fresh water then dried rather than just air dusted. My guess is that there was salt residue left on the surface prior to painting. I can't see how the air compressor moisture could have caused grief down the track if it didn't affect the application of the paint originally.
__________________
Reefmagnet is online now   Reply With Quote
Old 27-02-2014, 19:18   #15
Resin Head
 
minaret's Avatar

Cruisers Forum Supporter

Join Date: Aug 2007
Location: Seattle WA
Boat: Nauticat
Posts: 7,199
Images: 52
Re: Engine painting fail

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.
__________________

__________________
O you who turn the wheel and look to windward,

Consider Phlebas, who was once handsome and tall as you.
minaret is offline   Reply With Quote
Reply

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




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 14:25.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.