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 Post subject: Underside of fenders?
PostPosted: Sun Dec 18, 2016 8:26 pm 
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On the street
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Joined: Sun Dec 18, 2016 6:15 pm
Posts: 17
Location: Northern British Columbia
Country: Canada
Bikes owned: 72 GT750, 74 GT750, 75 T500, 09 DR650
Does anybody have recommendations for restoring the underside of fenders? When new these were probably were never chromed very well and might have even rusted when the bike was new. I could leave as is, or glass bead blast or even get it re-chromed. The latter option doesn't make sense because nobody will see under the fender (this bike will be a rider, not a concourse queen). Leaving as isn't ideal--the rusting will continue. And, glass bead blasting, while removing rust, would simply invite more rust. Has anyone ever painted the underside of fenders? Perhaps using a grey zinc primer? (of course I'd remove all the removable bits and properly mask everything to prevent spray on the chrome top. Thoughts?

O
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PostPosted: Mon Dec 19, 2016 2:29 am 
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World Superbike
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Joined: Thu Feb 16, 2012 11:50 am
Posts: 2141
Location: The Republic of South Yorkshire
Country: England
Bikes owned: GT550s GT750 GSX1400 and lots of spares
Wire brush or bead/media blast and paint with hammerite silver. No-one is any the wiser and it doesn't re-rust.


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PostPosted: Mon Dec 19, 2016 3:38 am 
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Road race school

Joined: Tue Dec 16, 2008 11:37 am
Posts: 897
Location: Trowbridge UK
Country: UK
Bikes owned: T500R, SV1000S, TS125, Seeley T500
+1 with the Hammerite Silver.


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PostPosted: Mon Dec 19, 2016 7:49 am 
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On the main road

Joined: Wed May 11, 2016 9:44 am
Posts: 119
Location: Saskatchewan
Country: Canada
Bikes owned: '72 gt750
I briefly googled the hammerite product, lots of good reviews on it in similar applications. Since you say its a rider and no one will see the underside of it I think POR15 would be a good option as well. Lots of people use it on car subframes so I can't imagine it wouldn't be up to the task here.

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'72 GT750


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PostPosted: Tue Dec 20, 2016 3:10 am 
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To the on ramp
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Joined: Sun Jul 13, 2014 7:55 pm
Posts: 242
Location: Greendale Vic, Australia
Country: Australia
Bikes owned: AS50, GS500, GT500, ex GSXR750 slabbie
Thoroughly clean and degrease, roughen up the surface, neutralise with rust converter, then paint with automotive underseal. It's thick and it will not chip with road gravel etc like 'normal' paint.


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PostPosted: Tue Dec 20, 2016 9:02 am 
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To the on ramp

Joined: Tue Jan 22, 2013 3:40 pm
Posts: 277
Country: Ontario, Canada
Bikes owned: B100P,T200, 68,70,74 T500,GS650G DL1000
I just use a silver rust inhibiting paint, I don't mask anything off, the over spray can be removed with acetone.

_________________
68 B100P x2
68 T500 Cobra x3
69 T500
70 T500 x2
74 T500
76 GT500
76 GT185 x2
81 GS650G x2
04 DL1000


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PostPosted: Sat Dec 24, 2016 6:16 pm 
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On the street
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Joined: Sun Dec 18, 2016 6:15 pm
Posts: 17
Location: Northern British Columbia
Country: Canada
Bikes owned: 72 GT750, 74 GT750, 75 T500, 09 DR650
Thanks for all the tips. I've decided to go with the POR15 product--Silver. In part because i was able to purchase the degreaser and etching cleaner right here in town at Canadian Tire and Lordco Auto parts. I ordered the pint of silver direct from POR15-Canada. Shipping cost was $15 which isn't too bad.

Merry Christmas everyone.

O


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PostPosted: Sun Dec 25, 2016 3:14 pm 
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On the street
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Joined: Mon May 23, 2011 4:23 am
Posts: 49
Location: Maleny, Queensland, Australia
Country: Australia
Bikes owned: Suzuki T20-250-350-500, DL650
My tip is to carefully examine the strengthening gusset spot welded to the underside as these have a hollow section which collects dirt, keeping a wet surface constantly against the metal and out of sight. Two of my mudguards have rusted badly under these gussets with the corrosion breaking through to the chromed top surface.


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PostPosted: Sun Dec 25, 2016 4:58 pm 
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World Superbike
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Joined: Thu Feb 16, 2012 11:50 am
Posts: 2141
Location: The Republic of South Yorkshire
Country: England
Bikes owned: GT550s GT750 GSX1400 and lots of spares
Nothing worse than a rusty gusset. I would think it's hell on the undercarriage.


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