Reply
 
Thread Tools Search this Thread
 
Old 12 March 2014, 05:55   #11
Member
 
Dan Gurney's Avatar
 
Country: UK - England
Town: Bingley, West Yorks
Boat name: Iolar
Make: Redbay
Length: 6m +
Engine: Suzuki DF140
Join Date: Sep 2012
Posts: 841
Looks tidy Neil. All you need now is to slap a nice coat of orange paint on it!
__________________

__________________
Dan Gurney is offline   Reply With Quote
Old 12 March 2014, 06:23   #12
Member
 
Country: UK - England
Town: Surrey
Boat name: Fugly & Rokraider 1
Make: Pac 22 & Porter 6.5
Length: 6m +
Engine: Ford 250 & jet,DT140
Join Date: Jun 2008
Posts: 681
Have they sprayed an etch primer or anything on it immeadiatly after the blasting? You don't want bare aluminium exposed to the air for long.
__________________

__________________
Rokraider is offline   Reply With Quote
Old 12 March 2014, 08:59   #13
Member
 
HUMBER P4VWL's Avatar
 
Country: UK - Wales
Town: N Wales Chester
Boat name: Mr Smith
Make: Humber
Length: 6m +
Join Date: Feb 2009
Posts: 5,013
Looks tidy Neil, you going to paint it now or can you leave it as is? Does it need treating?
__________________
HUMBER P4VWL is offline   Reply With Quote
Old 12 March 2014, 11:16   #14
Member
 
Country: USA
Town: Oakland CA
Length: 3m +
Join Date: Feb 2005
Posts: 6,653
Quote:
Originally Posted by Rokraider View Post
Have they sprayed an etch primer or anything on it immeadiatly after the blasting? You don't want bare aluminium exposed to the air for long.
Depends on the alloy. My RIB is 5200 series aluminum, untreated.

If you want the ultimate bling, have it cleaned (acid etched) and Alodyned; end result will be a nice gold color.

jky
__________________
jyasaki is offline   Reply With Quote
Old 12 March 2014, 17:35   #15
Member
 
neil.mccrirrick's Avatar
 
Country: UK - England
Town: Oldham
Boat name: Nemanda
Make: Aluminium
Length: 6m +
Engine: 140hp Tohatsu
MMSI: 235065639
Join Date: Jan 2008
Posts: 869
It's is ready for paint. But my plan was not to paint. I am under the impression that the ally will oxidise and finish up looking pretty much like a trailer does. Is this not the case?
__________________
If you don't like my opinion, I have others.
neil.mccrirrick is offline   Reply With Quote
Old 12 March 2014, 18:00   #16
Member
 
Country: USA
Town: Seattle
Boat name: Water Dog
Make: Polaris
Length: 4m +
Engine: Yamaha 60hp
Join Date: Apr 2007
Posts: 1,152
Quote:
Originally Posted by neil.mccrirrick View Post
It's is ready for paint. But my plan was not to paint. I am under the impression that the ally will oxidise and finish up looking pretty much like a trailer does. Is this not the case?
Its already oxidized, pretty much happens immediately. The bottom will stay looking basically as is due if used but stored dry on a trailer. I'd still have a nice big zinc on the transom somewhere to address any stray currents while its in the water or at a marina.

The topsides, if left unpainted, will get a little more corroded looking. Mostly just a visible blotchiness. There's no water flowing over them as a 'polish'. You can wax the topsides if you want, it will minimize the blotchy look. Wax will need to be renewed often but at least its not peeling paint.
__________________
captnjack is offline   Reply With Quote
Old 13 March 2014, 03:35   #17
Member
 
neil.mccrirrick's Avatar
 
Country: UK - England
Town: Oldham
Boat name: Nemanda
Make: Aluminium
Length: 6m +
Engine: 140hp Tohatsu
MMSI: 235065639
Join Date: Jan 2008
Posts: 869
Brill thanks. There are two mahoodsive zincs on the transom for just that problem so away we go. Good news
__________________
If you don't like my opinion, I have others.
neil.mccrirrick is offline   Reply With Quote
Old 13 March 2014, 05:42   #18
Member
 
Country: UK - England
Town: Surrey
Boat name: Fugly & Rokraider 1
Make: Pac 22 & Porter 6.5
Length: 6m +
Engine: Ford 250 & jet,DT140
Join Date: Jun 2008
Posts: 681
Personally, I would find out which grade of aluminium it is made from? Then see if you can get away with it unpainted.
__________________
Rokraider is offline   Reply With Quote
Old 13 March 2014, 11:35   #19
Member
 
Country: USA
Town: Oakland CA
Length: 3m +
Join Date: Feb 2005
Posts: 6,653
Neil;

"Ready for paint" implies the surface has been etched (paint doesn't stick too well to oxidized aluminum, which occurs pretty quickly after cleaning the surface - generally considered within the first hour or so.) The zinc chromate primers most people use as an undercoat etch the surface as they cure (I think.) Otherwise, an acid prep is used.

I assume you're talking cleaned, and stripped of all old paint.

As Jack said, normal oxidation turns the shiny aluminum surface a light-to-medium gray, with a chalky look and feel. Generally that's about as far as it goes, unless some other factor comes into play (dissimilar metal corrosion, electrolysis, etc.)

On my boat, the deck and console show that chalkiness, but the hull itself is still fairly bright. The top of the motor pod (which doesn't see a whole lot of water flow) is also still pretty bright. Can't really explain the latter part.

jky
__________________
jyasaki is offline   Reply With Quote
Old 14 March 2014, 13:56   #20
Member
 
neil.mccrirrick's Avatar
 
Country: UK - England
Town: Oldham
Boat name: Nemanda
Make: Aluminium
Length: 6m +
Engine: 140hp Tohatsu
MMSI: 235065639
Join Date: Jan 2008
Posts: 869
Top description that's just how it looks. In fact so chalky you think touching it will get dust on your hand. I have to say I quite like the finish. It looks better than the camera shows it

I need a sea trial now to see what effect the salty stuff does. Plus I'm a tad curious if getting all the old paint off will streamline so better fuel and faster top end.

Menai straits next weekend for the sea trail it is mind you Ive passengers this time so that's not going to help with a comparison
__________________

__________________
If you don't like my opinion, I have others.
neil.mccrirrick is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 -5. The time now is 18:07.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.