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SOHC.co.uk Forums => CB750 => Topic started by: Redders33 on February 25, 2020, 08:24:25 PM

Title: Tail cowl repair
Post by: Redders33 on February 25, 2020, 08:24:25 PM

Tail cowl repair, is araldite the best stuff still for cracked and broken plastics? Cheers Nick

Title: Re: Tail cowl repair
Post by: Rob62 on February 25, 2020, 08:59:48 PM

I’ve been doing a bit of plastic welding recently. I always used to use araldite in the past but it always fails eventually plus it looks a mess. All you need is a dremel (ideally) to scrape away any paint or previous repair material, a soldering iron and an old (or new) paint tray... avoid letting the solder iron get too hot, as long as it melts the plastic its hot enough, if it starts to smoke its getting too hot so keep turning it on and off to maintain the optimum temperature. Just press the iron into the crack and move down the cracked area using a prodding motion to fuse the area. If there is a gap or hole to fill just cut some filler strips from the black abs paint tray (available from your diy store for about 99p) and melt them into the repair. The repair will be very strong as you will have fused (welded) the repair. Then just sand down the area to finish the job.

Title: Re: Tail cowl repair
Post by: Redders33 on February 25, 2020, 09:12:57 PM

Cheers Rob I will give that a go 👍

Title: Re: Tail cowl repair
Post by: Bryanj on February 26, 2020, 02:40:52 AM

Also put some glass mat into the araldite to add strength if you use it

Title: Re: Tail cowl repair
Post by: paul G on February 26, 2020, 07:49:36 AM

Use David's Isopon P40 to re-enforce it.
You need to drill a small hole at the end of the crack, this stops it going any further.
Grind a V in the crack and clean a large area around it and then use the above.
Sorted ;D

Title: Re: Tail cowl repair
Post by: davefirestorm on February 26, 2020, 12:31:08 PM

[attachimg=1]

I have used this stuff recently on my side panel and also side panel lugs on my 250..Sets quickly and the lugs are solid and useable

Title: Re: Tail cowl repair
Post by: Spitfire on February 26, 2020, 01:26:32 PM

Not quite the same but this is the side panel on my bike it had a large crack in it as paul G said I drilled a hole at the bottom of the crack to stop it spreading, then as Bryan said I fibre glassed the inside, then filled the crack on the outside with gap filling CA (zap-a-gap medium CA) and sanded it smooth.
(https://imagizer.imageshack.com/img924/8735/56uo7M.jpg)
(https://imagizer.imageshack.com/img923/1012/WTSsQ5.jpg)
(https://imagizer.imageshack.com/img923/9498/VYh9N5.jpg)


Cheers

Dennis

Title: Re: Tail cowl repair
Post by: paul G on February 26, 2020, 02:19:57 PM

Dennis,
                          P40 is a fiber glass filler but fine strands and will smooth down very well  ;D

Title: Re: Tail cowl repair
Post by: hondarc166 on February 26, 2020, 04:57:25 PM

+1 on the power bond