Reply
 
Thread Tools Search this Thread
 
Old 10 March 2009, 17:45   #1
Member
 
Tim M's Avatar
 
Country: UK - England
Make: Avon Searider SR4
Length: 4m +
Engine: Yamaha 50
Join Date: Jan 2004
Posts: 5,767
Galvanising question

I've got a trailer I want to modify. The old galvanising is looking pretty tired, plus I want the new bits galvanised. If I modify it and send it to the galvanisers, will they accept it as a mix of old and new? Is there any special prep you need to do to previously galvanised steel?
__________________

__________________
Tim M is offline   Reply With Quote
Old 10 March 2009, 17:55   #2
Member
 
Country: UK - Scotland
Make: HumberOceanOffshore
Length: 8m +
Engine: Volvo KAD300/DPX
Join Date: Oct 2002
Posts: 5,395
Quote:
Originally Posted by Tim M View Post
I've got a trailer I want to modify. The old galvanising is looking pretty tired, plus I want the new bits galvanised. If I modify it and send it to the galvanisers, will they accept it as a mix of old and new? Is there any special prep you need to do to previously galvanised steel?
The galvanisers are usually ok with that. They will send it for blasting to remove all the dross and old zinc. Cost you tho. Phone em and ask.
__________________
JW.
jwalker is offline   Reply With Quote
Old 10 March 2009, 17:57   #3
RIBnet supporter
 
bedajim's Avatar
 
Country: UK - England
Town: Cambs/Northants
Length: no boat
Join Date: May 2006
Posts: 2,499
Quote:
Originally Posted by Tim M View Post
I've got a trailer I want to modify. The old galvanising is looking pretty tired, plus I want the new bits galvanised. If I modify it and send it to the galvanisers, will they accept it as a mix of old and new? Is there any special prep you need to do to previously galvanised steel?
Yep and charge extra to sort it out

No rust
no paint

You will probably need to shot blast the whole thing, then any galvanizing left on will be sorted by the pickling treatment pre galvanizing

All box tube sections to be drilled for draining + to allow the air to vent

After galvanizing you will need to clean out(drill) any holes + re tap any threaded holes before refitting of bits

Oh and blow out any shot blasting dust with an air line( before its galvanized)

Also any pigeon crap welds will often blow apart during galvanizing so they need to be done by someone who knows what they are doing

Jim
__________________
bedajim is offline   Reply With Quote
Old 10 March 2009, 18:00   #4
Member
 
martini's Avatar
 
Country: UK - Channel Islands
Town: jersey
Boat name: Martini II
Make: Arctic 28/FC470
Length: 8m +
Engine: twin 225Opti/50hp 2t
MMSI: 235067688
Join Date: Jun 2005
Posts: 3,023
Shouldnt need blasting, it gets dipped in chemicals to clean and degrease. Double dipping is a known process used for extra protection so the old zinc wont be a problem.

If its only smallish areas then you can buy these sticks of zinc which you can apply on with a little blow torch. Or even just give it a good coat of galvafroid, should get a year or 2 before the rust comes back.
__________________
martini is offline   Reply With Quote
Old 10 March 2009, 18:05   #5
Member
 
Tim M's Avatar
 
Country: UK - England
Make: Avon Searider SR4
Length: 4m +
Engine: Yamaha 50
Join Date: Jan 2004
Posts: 5,767
Quote:
Originally Posted by bedajim View Post
Also any pigeon crap welds will often blow apart during galvanizing so they need to be done by someone who knows what they are doing
Galvafroid it is then
__________________
Tim M is offline   Reply With Quote
Old 10 March 2009, 18:10   #6
RIBnet supporter
 
bedajim's Avatar
 
Country: UK - England
Town: Cambs/Northants
Length: no boat
Join Date: May 2006
Posts: 2,499
Quote:
Originally Posted by martini View Post
Shouldnt need blasting, it gets dipped in chemicals to clean and degrease. Double dipping is a known process used for extra protection so the old zinc wont be a problem.

If its only smallish areas then you can buy these sticks of zinc which you can apply on with a little blow torch. Or even just give it a good coat of galvafroid, should get a year or 2 before the rust comes back.
We've done some big stuff that needed to be double dipped, one end then the other with an over lap no problems but as soon as we have welded new to old or clean to galv, even with cleaning back first the local guys make us shot blast the crap off + any rust or paint
__________________
bedajim is offline   Reply With Quote
Old 10 March 2009, 18:10   #7
Member
 
Country: UK - England
Town: Mighty Penryn
Boat name: Little Joe.
Make: Avon Searider
Length: 4m +
Engine: Honda BF50
Join Date: Aug 2005
Posts: 8,869
Quote:
Originally Posted by bedajim View Post

Also any pigeon crap welds will often blow apart......

Jim
By 'pigeon crap' are you refering to 'seagull shit' welding?
__________________
Mollers is offline   Reply With Quote
Old 10 March 2009, 18:12   #8
RIBnet supporter
 
bedajim's Avatar
 
Country: UK - England
Town: Cambs/Northants
Length: no boat
Join Date: May 2006
Posts: 2,499
Quote:
Originally Posted by Tim M View Post
Galvafroid it is then
the thick hand painted stuff works the best ,but the spray on looks better in the short term if your tying to move it on
__________________
bedajim is offline   Reply With Quote
Old 10 March 2009, 18:13   #9
Member
 
martini's Avatar
 
Country: UK - Channel Islands
Town: jersey
Boat name: Martini II
Make: Arctic 28/FC470
Length: 8m +
Engine: twin 225Opti/50hp 2t
MMSI: 235067688
Join Date: Jun 2005
Posts: 3,023
Just had a big pair of fancy entrance gates delivered back to us from Wessex Galvanisers. After spending hours and hours cleaning every bit of spatter off the whole thing is covered in lumps and bumps and runs etc. Great big drips off every single finial, several areas where the galv reacted or something its been sanded down then sprayed up with silver paint!!

If they were my gates I certainly wouldnt accept them but they know theres not much we can do once they've been shipped back across the Channel.

And dont get me started on the shipping companies! One finial has been broken off and dissapeared and the 2 next to it were bent over almost 90 degrees!
__________________
martini is offline   Reply With Quote
Old 10 March 2009, 18:13   #10
RIBnet supporter
 
bedajim's Avatar
 
Country: UK - England
Town: Cambs/Northants
Length: no boat
Join Date: May 2006
Posts: 2,499
Quote:
Originally Posted by Mollers View Post
By 'pigeon crap' are you refering to 'seagull shit' welding?
This far inland it's Pigeon shit
__________________
bedajim is offline   Reply With Quote
Old 10 March 2009, 18:17   #11
RIBnet supporter
 
bedajim's Avatar
 
Country: UK - England
Town: Cambs/Northants
Length: no boat
Join Date: May 2006
Posts: 2,499
Quote:
Originally Posted by martini View Post
Just had a big pair of fancy entrance gates delivered back to us from Wessex Galvanisers. After spending hours and hours cleaning every bit of spatter off the whole thing is covered in lumps and bumps and runs etc. Great big drips off every single finial, several areas where the galv reacted or something its been sanded down then sprayed up with silver paint!!
Yep that's the new industry standard we use welding gauntlets to handle the stuff till we can dress it with a file
__________________
bedajim is offline   Reply With Quote
Old 10 March 2009, 18:17   #12
Member
 
Tim M's Avatar
 
Country: UK - England
Make: Avon Searider SR4
Length: 4m +
Engine: Yamaha 50
Join Date: Jan 2004
Posts: 5,767
Quote:
Originally Posted by bedajim View Post
the thick hand painted stuff works the best ,but the spray on looks better in the short term if your tying to move it on
Its only for personal use so I'm not bothered how it looks as long as it keeps the rust at bay.

The company that does the work for Hayling trailers said it would be 1.5x normal prices for all-ready galvanised stuff, just wasn't sure about a mixed job.

Thanks for all the replies.
__________________
Tim M is offline   Reply With Quote
Old 10 March 2009, 19:19   #13
Member
 
Country: UK - Wales
Town: West Wales
Make: Vipermax 5.8, SR4.7
Length: 5m +
Engine: 150 Opti, F50EFi
Join Date: Sep 2005
Posts: 6,298
Quote:
Originally Posted by Tim M View Post
Its only for personal use ...
I think there are better products than galvafroid out there for that.....
__________________
Downhilldai is offline   Reply With Quote
Old 11 March 2009, 13:36   #14
Member
 
Country: UK - England
Town: Southampton
Boat name: Hypercat
Make: Ringcat
Length: 7m +
Engine: Merc 300
Join Date: May 2005
Posts: 293
Quote:
Originally Posted by Tim M View Post
Its only for personal use so I'm not bothered how it looks as long as it keeps the rust at bay.

The company that does the work for Hayling trailers said it would be 1.5x normal prices for all-ready galvanised stuff, just wasn't sure about a mixed job.

Thanks for all the replies.
Tim I have some glavafroid in my garage I thgink if you want some
__________________
Trailer Bloke is offline   Reply With Quote
Old 11 March 2009, 13:53   #15
Member
 
Tim M's Avatar
 
Country: UK - England
Make: Avon Searider SR4
Length: 4m +
Engine: Yamaha 50
Join Date: Jan 2004
Posts: 5,767
Hi Simeon. Very kind. Let me know when you want your tent back
__________________
Tim M is offline   Reply With Quote
Old 11 March 2009, 16:36   #16
Member
 
Country: UK - England
Town: Salisbury
Boat name: TORA
Make: Tornado
Length: 4m +
Engine: Yamaha 60hp
Join Date: Jan 2009
Posts: 141
Send a message via Skype™ to TUFTY
better products

Quote:
Originally Posted by Downhilldai View Post
I think there are better products than galvafroid out there for that.....
What are the better products and where could I get some from?


Cheers

Tufty
__________________
TUFTY is offline   Reply With Quote
Old 11 March 2009, 16:57   #17
Member
 
Country: UK - Wales
Town: West Wales
Make: Vipermax 5.8, SR4.7
Length: 5m +
Engine: 150 Opti, F50EFi
Join Date: Sep 2005
Posts: 6,298
Quote:
Originally Posted by TUFTY View Post
What are the better products and where could I get some from?


Cheers

Tufty
You'd better ask gArfie.
__________________
Downhilldai is offline   Reply With Quote
Old 12 March 2009, 07:07   #18
Member
 
Country: UK - Wales
Town: porthcawl
Make: lomac
Length: 4m +
Engine: evinrude 40 etec o/b
MMSI: 235069383
Join Date: Feb 2008
Posts: 64
just thought have u tried, www.frost.co.uk i used them a lot when i restored my mini cooper,they have all the rust eaters ,paints and prep chemicals and everything you need worth a visit ,tony
__________________

__________________
greenkeg 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




All times are GMT -5. The time now is 07:18.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2020, vBulletin Solutions, Inc.