Repairing fibreglass rear wing

[Jim75]

Can anyone tell me is there a proper way to prepare fibreglass to sort a cracked rear wing. Couple stress fractures have been sorted and held fine but there’s a large crack (3-4”) which hasn’t held and the repair basically fell off.

 

[forblue]

What machine tractor, car or quad bike most of which will be moulded plastic as opposed to fibreglass for a start most cracks including metal can be stopped by drilling a small hole at end of crack, if it is moulded plastic it would be better to get it welded by a body shop, if repairing fibreglass will entail grinding back the outer parts till you reach the original layered glass matting you then need to jel and criss- crossed layers of mat soaked in jel for tutorials on this technique look at you tube, i can assure you if you have never done this before it will not be as easy as it looks and you will want a few pairs of gloves as this stuff will stick to anything..

 

[thesilentone]

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[Jim75]

What machine tractor, car or quad bike most of which will be moulded plastic as opposed to fibreglass for a start most cracks including metal can be stopped by drilling a small hole at end of crack, if it is moulded plastic it would be better to get it welded by a body shop, if repairing fibreglass will entail grinding back the outer parts till you reach the original layered glass matting you then need to jel and criss- crossed layers of mat soaked in jel for tutorials on this technique look at you tube, i can assure you if you have never done this before it will not be as easy as it looks and you will want a few pairs of gloves as this stuff will stick to anything..

case maxxum. Could be plastic but looks like it’s layered like fibreglass? Have done a bit with sprayer tanks when they’ve leaked but nothing like this.

 

[jamesy]

Ach, just fire in some super glue & baking soda!

 

[HDAV]

It’s possibly an SMC composite and needs an epoxy repair

got any photos? The right filler and prep should be fine is it a painted finish?

 

[Jim75]

It’s possibly an SMC composite and needs an epoxy repair

got any photos? The right filler and prep should be fine is it a painted finish?

 

[HDAV]

Should be an easy repair may need to sand it back then fill, doesn't have a big hole to fill the right base filler. Try an Epoxy if previous poly filler fell out and paint.


this may work out cheaper if you only need a little https://www.mbfg.co.uk/marine-grade...MIx-ai5pO18AIVxu7tCh1MEwraEAQYBCABEgJOjPD_BwE

 

[MrNoo]

Be fairly easy to repair, a lot of these parts are compressed composites and as mentioned I would use some laminating epoxy, grind it out 10:1 (10mm out for every 1mm of depth) then build up with layers of 2x2 twill untill you get the deired thickness, obviously as you put more layers in the width will increase so you need to cut them to fit and keep the "stack" in order. Let it cure off, sand fill if needed, prime and paint. The trick is making sure you grind it out correctly, on some parts I take it out at 15:1 much like the old wood scarf joints, repaired properly and if you try and break it again it wont break at the repair, it'll break elsewhere.
Epoxy will cure off faster with a little heat and you can post cure but that's all a bit too advanced for a tractor me thinks!