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Plastic case repair
- PeckPeekPoke
- Posts: 68
- Joined: Tue May 25, 2021 7:52 pm
- Location: New England
Plastic case repair
A couple of my STes arrived in the mail shattered, missing pieces of their plastic case. I've been wondering what the preferred method of patching holes in the plastic Atari case would be. I've been considering using automotive body-filler. I'm not sure if it will stay stuck for the long term. Perhaps this is a terrible idea; if so, aside from a replacement case, any suggestions? Thanks.
FOR GREAT JUSTICE. TAKE OUT EVERY ZIG
800xl+U1mb, STfm, STe, 030
800xl+U1mb, STfm, STe, 030
- stephen_usher
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Re: Plastic case repair
You could try Milliput (epoxy putty), but you'll have a lot of sanding down to do.
Intro retro computers since before they were retro...
ZX81->Spectrum->Memotech MTX->Sinclair QL->520STM->BBC Micro->TT030->PCs & Sun Workstations.
Added code to the MiNT kernel (still there the last time I checked) + put together MiNTOS.
Collection now with added Macs, Amigas, Suns and Acorns.
ZX81->Spectrum->Memotech MTX->Sinclair QL->520STM->BBC Micro->TT030->PCs & Sun Workstations.
Added code to the MiNT kernel (still there the last time I checked) + put together MiNTOS.
Collection now with added Macs, Amigas, Suns and Acorns.
- rubber_jonnie
- Site Admin

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Re: Plastic case repair
I had to repair a smashed Mega ST keyboard and used milliput to fill in the cracks. I also used small fibreglass patches (for nails) to reinforce internally.
Collector of many retro things!
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
- PeckPeekPoke
- Posts: 68
- Joined: Tue May 25, 2021 7:52 pm
- Location: New England
Re: Plastic case repair
Excellent suggestion. I had never heard of Milliput. Reading up on it, it seems to have the ideal versatility & rigidity.stephen_usher wrote: Wed Jan 18, 2023 9:06 pm You could try Milliput (epoxy putty), but you'll have a lot of sanding down to do.
FOR GREAT JUSTICE. TAKE OUT EVERY ZIG
800xl+U1mb, STfm, STe, 030
800xl+U1mb, STfm, STe, 030
- PeckPeekPoke
- Posts: 68
- Joined: Tue May 25, 2021 7:52 pm
- Location: New England
Re: Plastic case repair
Maybe someone in a fit of rage had smashed the keyboard over the top of the monitor! Sounds like a good fix though. Was the fibreglass necessary as an intermediary due to trouble getting the milliput to adhere to the Atari case?rubber_jonnie wrote: Wed Jan 18, 2023 9:55 pm I had to repair a smashed Mega ST keyboard and used milliput to fill in the cracks. I also used small fibreglass patches (for nails) to reinforce internally.
FOR GREAT JUSTICE. TAKE OUT EVERY ZIG
800xl+U1mb, STfm, STe, 030
800xl+U1mb, STfm, STe, 030
- rubber_jonnie
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Re: Plastic case repair
No, the fibreglass was on the inside to reinforce where I had to join case parts together, the Milliput I used externally to fill cracks afterwards. If you have holes you could use acetone or epoxy to stick the fibreglass inside to provide support for the Milliput when filling the holes.PeckPeekPoke wrote: Wed Jan 18, 2023 11:41 pmMaybe someone in a fit of rage had smashed the keyboard over the top of the monitor! Sounds like a good fix though. Was the fibreglass necessary as an intermediary due to trouble getting the milliput to adhere to the Atari case?rubber_jonnie wrote: Wed Jan 18, 2023 9:55 pm I had to repair a smashed Mega ST keyboard and used milliput to fill in the cracks. I also used small fibreglass patches (for nails) to reinforce internally.
Yep, it does need sanding but it is a nice smooth filler.
My keyboard repair is here: Mega ST keyboard repair
Collector of many retro things!
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
- PeckPeekPoke
- Posts: 68
- Joined: Tue May 25, 2021 7:52 pm
- Location: New England
Re: Plastic case repair
@rubber_jonnie Your Mega Keyboard came out Beautiful!
FOR GREAT JUSTICE. TAKE OUT EVERY ZIG
800xl+U1mb, STfm, STe, 030
800xl+U1mb, STfm, STe, 030
- PeckPeekPoke
- Posts: 68
- Joined: Tue May 25, 2021 7:52 pm
- Location: New England
Re: Plastic case repair
Perhaps someone knows what type of plastic ST cases are made of ... I have read that JB Weld's plastic formula is not for use with polyethylene or polypropylene.
FOR GREAT JUSTICE. TAKE OUT EVERY ZIG
800xl+U1mb, STfm, STe, 030
800xl+U1mb, STfm, STe, 030
- rubber_jonnie
- Site Admin

- Posts: 15214
- Joined: Thu Aug 17, 2017 7:40 pm
- Location: Essex
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Re: Plastic case repair
Thank you
Collector of many retro things!
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
- rubber_jonnie
- Site Admin

- Posts: 15214
- Joined: Thu Aug 17, 2017 7:40 pm
- Location: Essex
- Contact:
Re: Plastic case repair
BTW, these are the fibreglass patches I use:
You can cut them up into small pieces very easily and they add some integrity behind cracks. They're used in nail bars usually
You can cut them up into small pieces very easily and they add some integrity behind cracks. They're used in nail bars usually
Collector of many retro things!
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...