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Old 17 August 2010, 18:36   #1
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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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Old 17 August 2010, 18:39   #2
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s/s pop rivets? would these do...i think that what my seat lid is on with..

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Old 17 August 2010, 18:45   #3
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That might do it, thanks, will try it
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Old 17 August 2010, 18:52   #4
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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.

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Old 18 August 2010, 05:35   #5
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Originally Posted by boristhebold View Post
Any help appreciated.
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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Old 18 August 2010, 08:36   #6
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You could use 'nutserts':

http://www.a2a4.com/acatalog/A2A4_IN...O_A_2_837.html

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Old 18 August 2010, 10:02   #7
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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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Old 18 August 2010, 10:52   #8
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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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Old 18 August 2010, 15:50   #9
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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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Old 18 August 2010, 18:17   #10
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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 ... some years ago.
Wellnuts

I fixed your quote to save embarassment
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