Fiberglass ideas

[The Black Pig]

Has anyone got any tricks for ss self tapping screws that have pulled through fibreglass?
Larger screws aren't an option as I need the same countersunk size head
Thx

[nigel52]

Originally Posted by The Black Pig

Has anyone got any tricks for ss self tapping screws that have pulled through fibreglass? Larger screws aren't an option as I need the same countersunk size head Thx

Mix some fibreglass tape with some epoxy ie West System, wrap it round the screw and force into the hole. Take the screw out before the fibreglass sets. When set drill a hole slightly smaller than the screw. Then insert screw.
Alternatively soak a small bit of sponge in West epoxy and squeeze into hole. Wait to set and then drill.

[Jim Robinson]

Originally Posted by The Black Pig

Has anyone got any tricks for ss self tapping screws that have pulled through fibreglass?
Larger screws aren't an option as I need the same countersunk size head
Thx

You can get marine type inserts made from brass they are about 5mm bigger than the screw you want to use, you drill the hole out to the bigger size hammer these in and use a machine screw instead. They expand like a plasterboard fixing work well in plywood. Ribcraft used to fit them into the deck to hold the front leg of the a frame . http://www.fischer.co.uk/Home/tabid-...roductdetails/

[biffer]

If you can get to the back side of the panel then nut and bolt it

[Downhilldai]

Rivnut

[The Black Pig]

Thanks lads,

I'm not sure which method to use yet as I have time
I can't get to the other side to bolt, the fisher fixing would be good if they open behind like a plasterboard plug.

It's for the pulpit which has worked loose by the kids on the front Of the boat

[Downhilldai]

Pulpit fixed to GRP with self-tappers? No wonder they pulled out.

[gasman]

[QUOTE=Downhilldai;599747]Rivnut

Can you get them in any other material other that Alis munimul ? they will just dissolve in the salt other wise. I agree though, they are good.

[boristhebold]

Self Tapping screws are such a pain in the backside, I wish boat builders would stop using them, over time im planning on replacing all self tappers I can on my boat with nut and bolt where im able to. I hate self tappers.

[gtflash]

epoxy the hole to a peanut butter thickness mix of epoxy and cabosil or microfibres. if your screw sixze is same as hole size, over drill or file it so theres plety of epoxy to bite.

If you can taper the hole both sides, then it will never ever come out. if you cant get to one side, you could put allen key in a drill poke through hole and scratch off some of the other side, dependant on panel thickness

Its a common praxctive with thru transom fittings, to stop the rot.

[whisper]

You can get Stainless steel rivnuts, I have used them to fit gas struts in the past so they work well in the right application.

Stainless Steel Rivet Nuts

I don't know if I would use them on GRP though...

[Bigtalljv]

How about a picture? How much depth do you have to work with? Is there a big enough area to fit a backing plate in then patch it. The pulpit might cover the repair.

[Endeavour]

have you looked at these

Trisert 3 - Threaded Inserts for Aluminium

We use these on commercial and military craft