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Repairing cracked plastic?

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pepperami
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PostPosted: 19:56 - 06 Jun 2011    Post subject: Repairing cracked plastic? Reply with quote

So I`m trying to repair a Sachs XTC 125 and the plastic seat cowling is cracked (as they all do Sad ).

I was thinking of drilling both sides of the crack and wiring it together and then bonding a piece of plastic across the crack on the underside .
Or just bonding a piece of shaped plastic on the underside across the crack.

Here`s the question : what bonding glue/material to use?
Have any of the mighty BCF ever had experiance doing this?
Any pointers please Thumbs Up

Thanks in advance Smile
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P.addy
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PostPosted: 19:58 - 06 Jun 2011    Post subject: Reply with quote

I've seen someone "solder" it back together.

I say solder, a soldering gun and a cable tie... melts it back together n that Laughing
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Ichy
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PostPosted: 19:59 - 06 Jun 2011    Post subject: Reply with quote

I've yet to find an adhesive that works really well. If its ABS then it may be worth trying plastic pipe cement, used for guttering and other plastic pipes. Personally I get teh soldering iron out and do a bit of DIY plastic welding.
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Teflon-Mike
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PostPosted: 20:08 - 06 Jun 2011    Post subject: Reply with quote

From another thread:
Teflon-Mike wrote:
Find lightly scraping with a stanley blade quickest & easiest to get down to the base, rather than wasting lots of sand paper.
https://i178.photobucket.com/albums/w269/teflons-torque/Little%20Dreams/PlasticsAndDecals/imag2030.jpg
Tatty side Panel
https://i178.photobucket.com/albums/w269/teflons-torque/Little%20Dreams/PlasticsAndDecals/imag2035.jpg
Shave
https://i178.photobucket.com/albums/w269/teflons-torque/Little%20Dreams/PlasticsAndDecals/imag2036.jpg
Sand
https://i178.photobucket.com/albums/w269/teflons-torque/Little%20Dreams/PlasticsAndDecals/imag2037.jpg
Hi-Build
https://i178.photobucket.com/albums/w269/teflons-torque/Little%20Dreams/PlasticsAndDecals/imag2038.jpg
Paint In this case two tone, so silver first, mask, then mat black for the inset
https://i178.photobucket.com/albums/w269/teflons-torque/Little%20Dreams/PlasticsAndDecals/imag2041.jpg
Add decals, then laquer

If its rally BAD
https://i178.photobucket.com/albums/w269/teflons-torque/Little%20Dreams/PlasticsAndDecals/104_0299.jpg
After Shaving
https://i178.photobucket.com/albums/w269/teflons-torque/Little%20Dreams/PlasticsAndDecals/104_0346.jpg
Lugs can be built up by plastic welding, using soldering iron and similar texture 'scrap' plastic.. coat hangers work well....
https://i178.photobucket.com/albums/w269/teflons-torque/Little%20Dreams/PlasticsAndDecals/imag1915.jpg
Damaged areas can be welded up, and filled in, to remake the shape
https://i178.photobucket.com/albums/w269/teflons-torque/Little%20Dreams/PlasticsAndDecals/imag1919.jpg
Dressed by filing & sanding
https://i178.photobucket.com/albums/w269/teflons-torque/Little%20Dreams/PlasticsAndDecals/imag1936.jpg
Then 'smoothed' with hi-build before primering and painting
https://i178.photobucket.com/albums/w269/teflons-torque/Little%20Dreams/PlasticsAndDecals/imag1937.jpg
Before two-toning
https://i178.photobucket.com/albums/w269/teflons-torque/Little%20Dreams/PlasticsAndDecals/imag1941.jpg
after... with untouched panel from other side for comparison

- Soldering iron
- 'Scap' plastic filler rod
- Lots & lots of patience

I have 'bedded' washers or wire in accross splits... but, often makes life harder... just use plastic & if it breaks... do it again.
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pepperami
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PostPosted: 20:11 - 06 Jun 2011    Post subject: Reply with quote

I`ve heard of this "plastic welding?" but i`m not sure?

Thanks , it`s another option?
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pepperami
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PostPosted: 20:14 - 06 Jun 2011    Post subject: Reply with quote

Smile Well! I never thought I would ever be thinking about fixing my bike with bits of an old coat-hanger Smile Thumbs Up
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nowhere.elysium
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PostPosted: 20:41 - 06 Jun 2011    Post subject: Reply with quote

pepperami wrote:
Smile Well! I never thought I would ever be thinking about fixing my bike with bits of an old coat-hanger Smile Thumbs Up


You should've seen how the exhaust was held on to my 125.
Jubilee clips, a bean can, and some gardening wire.
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whitedevil
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PostPosted: 21:55 - 06 Jun 2011    Post subject: Reply with quote

Solder iron and some scrap plastic is the best option, unless you have money to burn.
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Fortuna
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PostPosted: 02:53 - 07 Jun 2011    Post subject: Reply with quote

whitedevil wrote:
Solder iron and some scrap plastic is the best option, unless you have PLASTIC to burn.

Edited, you can if your careful set fire to small amounts of plastic so that it's molten and then blow it out and leave to set. Works really well on larger cracks.
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Nexus Icon
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PostPosted: 12:23 - 07 Jun 2011    Post subject: Reply with quote

Watch the fumes. They're highly toxic and will give you the mother of all headaches if you're doing the repair indoors at a table.
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pepperami
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PostPosted: 20:21 - 08 Jun 2011    Post subject: Reply with quote

Fortuna wrote:
whitedevil wrote:
Solder iron and some scrap plastic is the best option.

you can if your careful set fire to small amounts of plastic so that it's molten and then blow it out and leave to set. Works really well on larger cracks.


I spent last night doing a bit of both and although the result is not to a Pro`s standard it seems to be holding Thumbs Up

So many thanks to M/s Tigress, Mr Teflon, Mr Devil & Mr Fortuna Thumbs Up
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