Forums :: NEW! Web Resources :: Features :: Photo Gallery :: Vintage Radio Shows :: Archives
Support This Site: Contributors :: Advertise


It is currently Dec Wed 08, 2021 4:12 am


All times are UTC [ DST ]





Post New Topic Post Reply  [ 14 posts ] 
Author Message
 Post subject: Need clear plastic crack repair technique
PostPosted: Jun Thu 24, 2021 12:35 am 
Member

Joined: Jul Sat 11, 2009 1:47 am
Posts: 313
Location: Cal
I've encountered several radio dial covers (the thick clear non flexible plastic type) that have hairline cracks in them. The cracks don't go all the way through, the covers are still sturdy, but the cracks stick out like a sore thumb, and no amount of polishing will reach them. Is there a product that might seep into these micro thin cracks to disguise them? Thought of using super glue, Plastipair (the liquid part only), or even plastic airplane glue, but don't want to make matters worse with the wrong method. Any suggestions of proven technique will be appreciated.


Top
 Profile  
 
 Post subject: Re: Need clear plastic crack repair technique
PostPosted: Jun Thu 24, 2021 3:30 am 
Member
User avatar

Joined: Jan Thu 01, 1970 1:00 am
Posts: 17044
Location: S. Dartmouth MA 02748-1225 USA
https://www.safelite.com/windshield-repair

:?:

_________________
List' & I will Enchant Thine Ear


Top
 Profile  
 
 Post subject: Re: Need clear plastic crack repair technique
PostPosted: Jun Thu 24, 2021 5:28 am 
Member
User avatar

Joined: Jan Thu 01, 1970 1:00 am
Posts: 39596
Location: SoCal, 91387
Safelite repairs glass; he's looking for a plastic repair method.

_________________
\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\He Who Dies With The Most Radios Wins/////////////////////////


Top
 Profile  
 
 Post subject: Re: Need clear plastic crack repair technique
PostPosted: Aug Sun 08, 2021 8:08 am 
New Member

Joined: Aug Sun 08, 2021 7:41 am
Posts: 1
I was hoping for an answer as well. I got a Knight CB Checker that has a cracked meter display.
On a YouTube comment it was suggested "Craftics Clear Acrylic Solvent Cement" specifically #1106002 but they have been out of stock for since I heard of it.


Top
 Profile  
 
 Post subject: Re: Need clear plastic crack repair technique
PostPosted: Aug Sun 08, 2021 8:59 pm 
Member

Joined: Jan Sat 25, 2020 5:23 am
Posts: 807
Location: Colorado Springs, CO 80917
I have a National NC Sixty Special with a crack in the plastic. Been waiting for a sure fire fix. Seems like thin cyanoacrylate is a candidate. But how to ensure it goes all the into the crack? Because if it cures & only penetrated partway, the game is over.


Top
 Profile  
 
 Post subject: Re: Need clear plastic crack repair technique
PostPosted: Aug Thu 19, 2021 2:49 am 
Member

Joined: Mar Tue 26, 2019 11:30 pm
Posts: 140
Location: Lexington, NC
If someone comes up with a way to do this, repair plastic lens, and it not showing the crack they have won the lotto IMHO! I've tried cyanoacrylate with no luck other then making sure the crack is glued up. I have used instant glue in cracks in plastic and Bakelite cabinets. After I routed out the crack with my Dremel tool with a grinding bit in preparation to fill the crack for repair but for lens nope!

_________________
David
KN4VBT


Top
 Profile  
 
 Post subject: Re: Need clear plastic crack repair technique
PostPosted: Aug Thu 19, 2021 4:36 am 
Member
User avatar

Joined: Oct Thu 18, 2007 11:34 am
Posts: 3989
Location: Port Orchard, Wa 98366
Super Glue ( cyanoacrylate ) isn't friendly to plastic most of the time it will frost over. However you may experiment. You could try clear epoxy.

Here a link that you can read about repairing cracks in plastics.

https://www.wikihow.com/Repair-Cracks-in-Plastic
-------------------------
There's even a suggestion about using Hot non-boiling water.

Or Clear nail polish https://ritely.com/nail-polish-hacks/

_________________
Visit our site:
http://antique-radio-lab.forumotion.com/
I was smokinradios Long time ago (2004)


Top
 Profile  
 
 Post subject: Re: Need clear plastic crack repair technique
PostPosted: Aug Thu 19, 2021 5:50 am 
Member

Joined: Jan Sat 25, 2020 5:23 am
Posts: 807
Location: Colorado Springs, CO 80917
Everyone has ideas about WHAT to put into/onto the crack but it seems to me that a critical part of the fix is how to ensure the chemicals of your choice actually penetrate the crack fully, both longitudinally and depth. I imagine there'd be nothing more frustrating than to apply the magical elixir but when it has set there's still a feathery end of the crack that was never penetrated & may now be sealed off from further access.


Top
 Profile  
 
 Post subject: Re: Need clear plastic crack repair technique
PostPosted: Aug Thu 19, 2021 10:31 pm 
Member
User avatar

Joined: Jan Thu 01, 1970 1:00 am
Posts: 39596
Location: SoCal, 91387
I don't see how a crack in plastic, and ESP clear plastic, can be made invisibly.

It's the same as Bakelite in that regard, where the two sides might be joined together W/O any noticeable trace of the bonding agent (that pretty well leaves out Crazy Glue), but there will still be a visible hairline.

_________________
\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\He Who Dies With The Most Radios Wins/////////////////////////


Top
 Profile  
 
 Post subject: Re: Need clear plastic crack repair technique
PostPosted: Aug Thu 19, 2021 11:35 pm 
Member

Joined: Mar Tue 26, 2019 11:30 pm
Posts: 140
Location: Lexington, NC
[quote="Radiosmoker"]
Here a link that you can read about repairing cracks in plastics.

https://www.wikihow.com/Repair-Cracks-in-Plastic

I like the tip listed about using acetone and scrap plastic to make a slurry to repair cracks. Never knew you could do that so you do learn something new everyday, thanks. Yet with all these tips on how to repair plastic none of them achieve what the OP is looking for a clear plastic crack repair that doesn't show.

_________________
David
KN4VBT


Top
 Profile  
 
 Post subject: Re: Need clear plastic crack repair technique
PostPosted: Aug Thu 19, 2021 11:39 pm 
Member
User avatar

Joined: Jan Thu 01, 1970 1:00 am
Posts: 17044
Location: S. Dartmouth MA 02748-1225 USA
hwhall wrote:
Everyone has ideas about WHAT to put into/onto the crack but it seems to me that a critical part of the fix is how to ensure the chemicals of your choice actually penetrate the crack fully, both longitudinally and depth. I imagine there'd be nothing more frustrating than to apply the magical elixir but when it has set there's still a feathery end of the crack that was never penetrated & may now be sealed off from further access.
Vacuum.

_________________
List' & I will Enchant Thine Ear


Top
 Profile  
 
 Post subject: Re: Need clear plastic crack repair technique
PostPosted: Aug Fri 20, 2021 12:25 am 
Member

Joined: Jan Sat 25, 2020 5:23 am
Posts: 807
Location: Colorado Springs, CO 80917
Quote:
Vacuum


I've thought something like that might help. Have you done it? Details? Vacuum chamber? Vacuum on one side? How much vacuum? There may be only one shot at getting it right for the piece to be repaired.

If a chamber, seems one must apply the cement/glue/solvent before closing in a vac chamber & pumping down, so there's a bit of a race between cement/glue/solvent set-up time & the time needed to do the vacuum trick.


Top
 Profile  
 
 Post subject: Re: Need clear plastic crack repair technique
PostPosted: Sep Mon 06, 2021 5:20 am 
Member
User avatar

Joined: Dec Sat 24, 2011 9:17 pm
Posts: 8571
Location: Vancouver Island, Canada
Some of us can remember getting model glue on the windshield of a plastic model, ugly.

_________________
Watch the doughnut, not the hole.
Burl Ives, RIP, oldtimer.
[:l>)


Top
 Profile  
 
 Post subject: Re: Need clear plastic crack repair technique
PostPosted: Sep Wed 08, 2021 8:03 pm 
Member

Joined: Jan Thu 01, 1970 1:00 am
Posts: 1398
Location: Hartford, KY
Have you tried Mark Palmquist? He might have a repro for your radio. www.dialcover.com


Top
 Profile  
 
Post New Topic Post Reply  [ 14 posts ]  Moderator: Peter

All times are UTC [ DST ]


Who is online

Users browsing this forum: No registered users and 2 guests



Search for:
Jump to:  




































Privacy Policy :: Powered by phpBB