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17 August 2010, 23:36
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#1
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Member
Country: UK - England
Length: 7m +
Join Date: Aug 2009
Posts: 1,619
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Help - GRP and self tapping screws
I bet a few of you have experienced the joy of what is inevitable when you have things on your rib or other boats attached to grp with self tapping screws ? Yes they come apart as the grp gets cracked. I have a seat back which folds up to access the area at the stern holding the battery and bilge pump, the bracket has come loose. I can't use bolts as there is no access behind the fixing holes. So is it case of filling the holes with somemform of grp repair stuff and redriling fixing with same screws or anyone have a better idea.
I wish boat builders would stop using screwsnwith grp.
Any help appreciated.
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17 August 2010, 23:39
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#2
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Member
Country: UK - Scotland
Town: Central Belt of Scotland
Boat name: Puddleduck III
Make: Bombard
Length: 5m +
Engine: 50 HP
Join Date: Mar 2009
Posts: 2,066
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s/s pop rivets? would these do...i think that what my seat lid is on with..
S.
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SPRmarine / SPRtraining
RYA Training Courses & Safety Equipment Sales
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17 August 2010, 23:45
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#3
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Member
Country: UK - England
Length: 7m +
Join Date: Aug 2009
Posts: 1,619
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That might do it, thanks, will try it
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17 August 2010, 23:52
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#4
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Member
Country: UK - Scotland
Town: Central Belt of Scotland
Boat name: Puddleduck III
Make: Bombard
Length: 5m +
Engine: 50 HP
Join Date: Mar 2009
Posts: 2,066
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BTW -My boat name is Puddleduck III, Puddleduck I - was named in 1976, Puddleduck II in 1996... Puddleduck III in 2000.
S.
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SPRmarine / SPRtraining
RYA Training Courses & Safety Equipment Sales
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18 August 2010, 10:35
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#5
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RIBnet admin team
Country: Ireland
Length: 4m +
Join Date: Feb 2008
Posts: 14,898
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Quote:
Originally Posted by boristhebold
Any help appreciated.
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You might try a Stainless Steel Snaptoggle (toggle bolt). You'll need a very small set, I'd imagine.
I use 'em at work where I can't get access behind bulkheads. They're Legend. Mild steel units cost about £1.50. Stainless version? 
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18 August 2010, 13:36
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#6
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Member
Country: UK - Wales
Town: West Wales
Make: Vipermax 5.8, SR4.7
Length: 5m +
Engine: 150 Opti, F50EFi
Join Date: Sep 2005
Posts: 6,299
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18 August 2010, 15:02
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#7
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Member
Country: UK - England
Town: Buckingham
Make: Ribcraft 4.8
Length: 4m +
Engine: Mariner 75
Join Date: Feb 2007
Posts: 360
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I was going to suggest using stainless steel rivnuts, but I don't think that the fibreglass will take the pressure without cracking when you expand the rivnuts to make them hold ...
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18 August 2010, 15:52
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#8
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Member
Country: UK - Wales
Town: West Wales
Make: Vipermax 5.8, SR4.7
Length: 5m +
Engine: 150 Opti, F50EFi
Join Date: Sep 2005
Posts: 6,299
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Wellnuts would be ok for lightweight loading applications in GRP, but I don't know whether they're available in stainless.
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18 August 2010, 20:50
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#9
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Member
Country: UK - England
Town: Bursledon
Boat name: Mustard
Make: Ribeye 785
Length: 7m +
Engine: Yamaha 200/Merc 6
MMSI: 235068693
Join Date: Oct 2006
Posts: 618
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Rawlplug do a rubber plug with a brass nut inside. i don't remember what they are called. I used them extensively on a Dell Quay Dory some years ago.
Use stainless bolts and stuff them with silicone grease to prevent dissimilar metal corrosion.
They were brilliant.
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Tony
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18 August 2010, 23:17
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#10
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Member
Country: UK - Wales
Town: West Wales
Make: Vipermax 5.8, SR4.7
Length: 5m +
Engine: 150 Opti, F50EFi
Join Date: Sep 2005
Posts: 6,299
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Quote:
Originally Posted by JABS
Rawlplug do a rubber plug with a brass nut inside. i don't remember what they are called. I used them extensively ... some years ago.
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Wellnuts 
I fixed your quote to save embarassment 
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18 August 2010, 23:35
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#11
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Member
Country: UK - Scotland
Town: Central Belt of Scotland
Boat name: Puddleduck III
Make: Bombard
Length: 5m +
Engine: 50 HP
Join Date: Mar 2009
Posts: 2,066
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Quote:
Originally Posted by Downhilldai
Wellnuts
I fixed your quote to save embarrassment |
lol - could been worse , i know a person who tried used pop rivets to fix a hole in a hull of an aluminium boat... seamed good idea till i point out a slight flaw in plan...
S.
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SPRmarine / SPRtraining
RYA Training Courses & Safety Equipment Sales
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18 August 2010, 23:38
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#12
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Member
Country: UK - Scotland
Town: Glasgow
Boat name: stramash
Make: Tornado
Length: 5m +
Engine: Etec 90
Join Date: Feb 2006
Posts: 5,090
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Quote:
Originally Posted by Downhilldai
Wellnuts
I fixed your nuts to save embarassment |
oooh.. suit you Sir
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19 August 2010, 07:56
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#13
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Member
Country: UK - England
Town: Bursledon
Boat name: Mustard
Make: Ribeye 785
Length: 7m +
Engine: Yamaha 200/Merc 6
MMSI: 235068693
Join Date: Oct 2006
Posts: 618
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Quote:
Originally Posted by Downhilldai
Wellnuts
I fixed your quote to save embarassment |
Cripes, almost let the cat out of the bag there!
We almost moved over to wet foam again!
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Tony
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