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Portland Cement glazing putty removal
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 Posted: Wed Feb 4th, 2015 03:54 pm
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Vic
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I am doing what appeared to be your basic/simple broken glass repair. Old window glass in 3/16 HR lead. BUT, the "putty" under the lead looks and acts like pure Portland Cement. So far I've tried:
1- steam (usually works on everything)
2- straight ammonia
3- silicone lube
4- dental picks, mat knife and assorted tools of destruction.

any ideas?



 Posted: Thu Feb 5th, 2015 01:56 am
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axgold
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Cavitron?



 Posted: Thu Feb 5th, 2015 08:00 pm
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BloodGlass
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I'm sorry to say but I have encountered Portland cement many many times and have never found a real easy solution to the problem of removing it from glass or from whatever the structure material is(lead,zinc, brass...) I have always gone with very carefully chipping away at it or using small scale grinding/sanding tools on a demel, Mostly hours of chipping.
If there is anyone who has the magic answer I too would be grateful to learn it!



 Posted: Fri Feb 6th, 2015 02:32 am
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Vic
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I think I have answered my own question.
All these products have GLYCOLIC ACID

I got Sakrete concrete Motor Dissolver. I bushed it on and picked out the soft cement. took a couple of applications, and must be done while wet.

The window I'm working on is leaded with window glass (c.1920)

DO NOT take this as an endorsement. All I can say is that is working in MY application.



http://www.homedepot.com/p/Mean-Klean-1-gal-Concrete-and-Mortar-Dissolver-MK128OZ/203074598?cm_mmc=Shopping%7cBase&gclid=CjwKEAiAxsymBRCegqiLzI7Q1S8SJADOgQrz3EpKLVaRLyZJokRpGuB8uNHsq1xYO-mfWu-Hz3DsCxoC28Tw_wcB&gclsrc=aw.ds




http://www.homedepot.com/p/SAKRETE-22-oz-Concrete-Mortar-Dissolver-65510207/204675360?N=5yc1vZbogf




http://www.speedycleanusa.com/concretedissolverinfo.php



 Posted: Fri Feb 6th, 2015 02:45 pm
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Don Burt
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Paint remover and oven cleaner come to mind as heavy weapons.



 Posted: Wed May 27th, 2020 04:43 pm
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Don Burt
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I took apart a panel I made in the late 1970's. There's glass I want to salvage in the pile now. No paint. Vic you usually use steam (if you still use the same methods as your 2015 post above). This is a linseed oil and whiting putty, or maybe Dap 33. It's crumbly but still pretty well stuck. How does one use steam to get the putty off?

The lead is full of putty of course. It's in the trash for pickup tomorrow. Will lead recyclers take it in that condition, in your experience?

Update June 1: I was able to get the glass clean fairly easily by soaking it in grocery store strength ammonia overnight. Just a little wire brush work on each piece. Forty year old putty. Not bad. Not a fun process though. I threw the lead in the trash and it's out of sight forever, save the lingering regret of my lifetime accumulation ledger of environmental damage.

Last edited on Mon Jun 1st, 2020 02:02 pm by Don Burt



 Posted: Wed Jun 10th, 2020 06:32 am
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bkessler
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Hey Don: In the future, instead of trashing your old lead, you might ask around and see if you know any hunters or shooters. A friend of mine takes all the scrap lead I can give him, and melts it down for bullets. Not sure if the dirty lead would be a problem for them (mine is pretty "clean", as we don't do repair work), but it might be worth an ask.

I also have recycled my lead scraps via the GA Avril Company, here in Cincinnati, but I know they want that stuff free of contaminates.

Last edited on Wed Jun 10th, 2020 06:33 am by bkessler



 Posted: Sat Jun 13th, 2020 04:44 pm
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Vic
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take old lead to a scrape recycle center. They pay .40-.50 cents a pound. Dirty OK



 Posted: Mon Jul 6th, 2020 04:47 am
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Maria
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We have a scrap recycler picking up our scrap and old lead from dismantled windows. They pick up and pay (well) for lead that is "dirty" with old putty.



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