Reply
 
Thread Tools Search this Thread
 
Old 20 June 2021, 15:14   #1
Member
 
Country: UK - England
Town: Boat is in Plymouth
Boat name: T/T Coracle
Make: Brig
Length: 3m +
Engine: Suzuki DF20 ATS
Join Date: Apr 2021
Posts: 17
Brown stains

Some brown stains have appeared on the tubes of our RIB and I'm not sure what they are or how to remove them. Any ideas?
Attached Thumbnails
Click image for larger version

Name:	20210620_182046[1].jpg
Views:	140
Size:	94.2 KB
ID:	137817  
__________________

__________________
TwoHooter is offline   Reply With Quote
Old 20 June 2021, 15:59   #2
Member
 
Pikey Dave's Avatar
 
Country: UK - England
Town: South Yorks
Boat name: Black Pig
Make: Ribcraft
Length: 5m +
Engine: DF140a
MMSI: 235111389
Join Date: Feb 2008
Posts: 10,688
RIBase
Quote:
Originally Posted by TwoHooter View Post
Some brown stains have appeared on the tubes of our RIB and I'm not sure what they are or how to remove them. Any ideas?


Looks like PVC uv degradation. The beginning of the end.
__________________

__________________
Rule#2: Never argue with an idiot. He'll drag you down to his level & then beat you with experience.
Rule#3: Tha' can't educate pork.
Rule#4:https://www.youtube.com/watch?v=unkIVvjZc9Y
Pikey Dave is offline   Reply With Quote
Old 20 June 2021, 16:50   #3
Member
 
Maximus's Avatar
 
Country: UK - England
Town: Wild West
Boat name: No Boat
Make: No Boat
Length: under 3m
Join Date: Jan 2008
Posts: 5,174
Send a message via AIM to Maximus
Quote:
Originally Posted by Pikey Dave View Post
Looks like PVC uv degradation. The beginning of the end.
My thoughts too....
__________________
A clever Man learns by his mistakes..
A Wise Man learns by other people's!

The Road to HELL ..is Paved with "Good inventions!"
Maximus is offline   Reply With Quote
Old 21 June 2021, 11:41   #4
Member
 
Country: UK - England
Town: Boat is in Plymouth
Boat name: T/T Coracle
Make: Brig
Length: 3m +
Engine: Suzuki DF20 ATS
Join Date: Apr 2021
Posts: 17
Thanks for the comments. This came on very suddenly - over a period of about 48 hours. Does that sound typical?
__________________
TwoHooter is offline   Reply With Quote
Old 21 June 2021, 12:17   #5
Member
 
Pikey Dave's Avatar
 
Country: UK - England
Town: South Yorks
Boat name: Black Pig
Make: Ribcraft
Length: 5m +
Engine: DF140a
MMSI: 235111389
Join Date: Feb 2008
Posts: 10,688
RIBase
Quote:
Originally Posted by TwoHooter View Post
...Does that sound typical?


Not really. What does it feel like, is it sticky?
__________________
Rule#2: Never argue with an idiot. He'll drag you down to his level & then beat you with experience.
Rule#3: Tha' can't educate pork.
Rule#4:https://www.youtube.com/watch?v=unkIVvjZc9Y
Pikey Dave is offline   Reply With Quote
Old 21 June 2021, 12:27   #6
Member
 
Country: UK - England
Town: suffolk
Boat name: not yet
Make: Nautica/ribcraft
Length: 5m +
Engine: Yam 115/ Honda 100
Join Date: Jan 2015
Posts: 866
Looks like mildew under the top suface on hypalon to me ,seems quite common on sunshine drenched white ribs ,maybe try some bleach based shmufflex or similar ; but i think the beginning of the end is maybe an accurate assesment
__________________
Orwell boy is offline   Reply With Quote
Old 21 June 2021, 12:36   #7
Member
 
Country: UK - England
Town: Boat is in Plymouth
Boat name: T/T Coracle
Make: Brig
Length: 3m +
Engine: Suzuki DF20 ATS
Join Date: Apr 2021
Posts: 17
The patches are not sticky.

I have never known whether the tubes are PVC or Hypalon. The RIB is a Suzumar, new in 2005. The RIB has always been kept under covers but was lent to a friend for a couple of weeks recently and not covered, when it came back it was in bright sun for 2 days before we got it into a shed.

I'll try the bleach idea on a small patch. I've already tried Liquid Rib which has never failed to bring it up until this time.

It's a pity - it's a nice RIB, good hull shape, no patches, holds its air well, sometimes goes a full year without needing a few puffs from the pump. Very sad if it is UV rot.
__________________
TwoHooter is offline   Reply With Quote
Old 21 June 2021, 14:27   #8
Member
 
Country: USA
Make: AB
Length: 3m +
Engine: outboard, 40hp
Join Date: Feb 2016
Posts: 55
Is it possible a chemical stain from a spill? Looks like there are spots on the rope and on the rubber fixture on the right. Not just the fabric. Kinda hard to tell from the pic.
__________________
babbot1 is offline   Reply With Quote
Old 21 June 2021, 14:42   #9
Member
 
Country: UK - England
Town: Boat is in Plymouth
Boat name: T/T Coracle
Make: Brig
Length: 3m +
Engine: Suzuki DF20 ATS
Join Date: Apr 2021
Posts: 17
I'm going to take some more pictures tomorrow.
Turns out the boat has been handled by some non-boating people since it got back.
They say all they did was spray it with Liquid Rib and wash it off with a jetwash, but the place this was done might have had some other stuff floating around.
__________________
TwoHooter is offline   Reply With Quote
Old 21 June 2021, 17:05   #10
Member
 
Country: UK - Scotland
Length: 4m +
Join Date: Nov 2020
Posts: 4
I have a stain like that on one part of my tubes and was told it could be from sunscreen that has rubbed off onto the tube?
__________________
Barrel Rider is offline   Reply With Quote
Old 23 June 2021, 13:25   #11
Member
 
Striker's Avatar
 
Country: UK - England
Length: 7m +
Join Date: Nov 2017
Posts: 70
Brown stains

It looks like something spilled rather than degradation. If you zoom in itís on more than just the tube material.
__________________
Striker is offline   Reply With Quote
Old 23 June 2021, 15:58   #12
Member
 
spartacus's Avatar
 
Country: UK - Scotland
Town: Aberdeenshire
Boat name: Sula
Make: Ribcraft 4.8m
Length: 4m +
Engine: Tohatsu 60hp + aux
MMSI: 235087213
Join Date: Jun 2007
Posts: 4,156
RIBase
First rule, never lend your boat to anyone!

If it is a chemical mark, then the options are limited. Whatever it is, it has either been applied neat, or has reacted with UV light as I see it on the rubber handle too.

You could try Rib Revive or similar, even TFR (traffic film remover) and Scotchbrite pad, with gloves of course, work it, then rinse thoroughly.

If that doesn't do anything, then a solvent such as MEK, however that will soften the PVC, so using sparingly.

One option is you could patch that area with a strip of grey PVC material to the rubbing strake, and mirror on the other side, or just live with it.
__________________
Is that with or without VAT?
spartacus is offline   Reply With Quote
Old 23 June 2021, 16:06   #13
Member
 
Country: UK - England
Town: Retford
Boat name: Spy-sea-one
Make: Excel 435
Length: 4m +
Engine: Suzuki Outboard/25/4
Join Date: Oct 2011
Posts: 6,758
RIBase
Jet wash is the problem IMO I’d never use one on a tube
__________________
jeffstevens763@g is offline   Reply With Quote
Old 24 June 2021, 03:00   #14
Member
 
neil.mccrirrick's Avatar
 
Country: UK - England
Town: Oldham
Boat name: Miss Isle
Make: Solent 6.9
Length: 6m +
Engine: 225 optimax
Join Date: Jan 2008
Posts: 1,195
It's not consistent which makes it more likely somthing was spilled and then left, perhaps in the sun and its baked in. More pics would help but I think you have a cosmetic issue
__________________
I was born not knowing and have had only a little time to change that here and there.
neil.mccrirrick is offline   Reply With Quote
Old 24 June 2021, 08:09   #15
RIBnet Supporter
 
willk's Avatar
 
Country: Ireland
Make: Redbay Boats
Length: 9m +
Engine: 370hp
Join Date: Feb 2008
Posts: 14,270
RIBase
Quote:
Originally Posted by TwoHooter View Post
This came on very suddenly - over a period of about 48 hours. Does that sound typical?
Could it be rust? If some rust or iron filings got on wet tubes they would stain. Oxalic Acid or Proprietory Rust remover for boat hulls would remove it easily.

I really enjoyed the title of this thread. I assumed someone had a near miss or a rough exit through Haulover Creek...
__________________
Who knows what evil lurks in the hearts of men?
willk is offline   Reply With Quote
Old 24 June 2021, 12:08   #16
Member
 
Country: UK - England
Town: Boat is in Plymouth
Boat name: T/T Coracle
Make: Brig
Length: 3m +
Engine: Suzuki DF20 ATS
Join Date: Apr 2021
Posts: 17
Well I haven't got to the bottom of it yet - been very short of time due to some business problems. I've read every response and will work through this.

It did occur to me that it might be rust and I have some Oxalic acid on the mothership and hope to get there next week. I've found a couple of tiny patches where I can experiment reasonably safely.

Thanks again - I will report back.
__________________

__________________
TwoHooter 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 09:08.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2021, vBulletin Solutions, Inc.