Drilling epoxy/filler

[pepperami]

So I’m working on the fairing of project ‘Hyosung Shyte Heap’.
The original fixings are dreadful and weak.

I’m trying to improve/repair what’s left of the fixings and have an idea.
I’m thinking of completely filling the fixings spaces and then drilling and tapping in a new thread.
In my patch tests, Isopon P40 appears to have the strongest bond and has a hardness/toughness?

So I’m asking the mighty BCF : is drilling Isopon P40 and tapping a new thread a viable idea.?
I’ve never drilled Isopon before.
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I am the sum total of my own existence, what went before makes me who I am now!

[stinkwheel]

I know JB weld takes a tap nicely.

P40 looks like it's a chopped fibreglass based polyester resin though? I'm not sure how well that'll take a tap and could well land up with a raggedy hole. Might be better off with a well-nut or rivnut in a wider hole? Not even sure how well it'll cure through if it's applied thickly? Maybe even build a nut into the filler if you want a thread in there?

If you thickened resin with something like aluminium dust, you'd get a pretty robust material.

I'm not entirely clear what you're proposing to do though. Isposon is usually used to fill voids in rusty but non-structural bodywork, not to take structural fittings..
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[jaffa90]

I`ve used JB weld where the thread was stripped in a very hard plastic hole, so i filled the hole with JB but had no room to tap it, so i fitted the bolt with a thin coating of thin oil on the threads and removed it after 12 hours just before hardening and it worked ok.

[pepperami]

[MCN]

I wouldn't waste money on JB Weld. It's over rated now-a-days. The guy who invented passed away, his Mrs. kept it going and some shrewd marketing followed. (And it's not so widely available in U.K.)
There are much better materials available now.
We used https://www.belzona.com/en/index.aspx
to repair alumininininuniunm engine sump pans on big fcuk off marine diesels. Sticks like-shite-to-a-blanket and excellent machine-ability.

If it's a plastic fairing then it's most likely ABS and weld-able using ABS weld methods.

Or just cut to the chase and use Plastex.

At a pinch.... Baking Powder and Superglue will stick to it and is quite tough. And cheaper than a bag of chips.
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Disclaimer: The comments above may be predicted text and not necessarily the opinion of MCN.

[Robby]

Did the original fairings have threads tapped into plastic? Never seen that before, I've always seen them use a captive nut of some kind.

Captive nut allows for things to move around a bit as you tighten them. A fixed thread does not.

[stinkwheel]

Or rivett on dzeus fastener backplates.
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[pepperami]

[pepperami]

[Riejufixing]

[ThatDippyTwat]

ABS stick/sheet, soldering iron. You can use brass captive nuts and melt them into whatever you want to fasten easily enough. They're very inexpensive things.

https://sc02.alicdn.com/kf/HTB1R0PMbifrK1RjSspbq6A4pFXaK/220932354/HTB1R0PMbifrK1RjSspbq6A4pFXaK.jpg
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'98 VFR800 (touring) - '12 VFR800 Crosrunner (Commuting) - '01 KDX220 (Big Green Antisocial Machine)

[stinkwheel]

Pop rivett and bond alloy brackets to it. If aesthetics don't matter.
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[MCN]

[steve the grease]

There are these things , which I have now discovered are called chimney nuts... They are like a clip on nut so you could clip them onto a panel edge, or alternatively clip them onto a strip of metal , which could then be fixed to the fairing with epoxy or whatever....They are so useful.

https://www.ebay.co.uk/itm/SPIRE-CLIPS-CHIMNEY-NUTS-SPEED-CLIPS-U-NUTS-LUG-NUT-PANEL-FASTENERS-M4-M5-M6-M8/163062209039?hash=item25f743da0f:g:ygAAAOSwyARbO0~P
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All the above is my personal opinion, you can see my lips move, but I'm talking out of my arse.
I've been riding, and fixing , bikes for 50 years, in that time the more I learn, the less I am absolutely sure of.....

[pepperami]

[Riejufixing]

[pepperami]

[Riejufixing]

Stainless are good. https://www.speedyfasteners.com/10x_M5_Motorcycle_Fairing_Clips_Bolts_p/sf111.htm

[xX-Alex-Xx]