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 Post subject: How do you remove dried-up masking tape?
PostPosted: Apr Wed 24, 2019 3:30 am 
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Joined: Aug Thu 06, 2009 12:20 am
Posts: 418
Location: Wheat Ridge, CO
I just found a beautiful Stromberg-Carlson 1950s tube amp with a cool green paint job (original). The power and output transformers are both painted the same color. However, someone put some masking tape on the power transformer and it is now dried up and hard as a rock. Does anyone have any suggestions as to how to get this stuff off? I tried isopropyl alcohol and it didn't work. I don't want to damage the paint underneath the tape.

Thanks


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 Post subject: Re: How do you remove dried-up masking tape?
PostPosted: Apr Wed 24, 2019 3:53 am 
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Joined: Nov Mon 05, 2007 11:08 pm
Posts: 2902
Location: Calgary Alberta
I would try goof off or goo be gone. I think goof off comes in a spray and just spray it on ,let it sit and it will soak into the dried glue. Then peel the tape off .
It might take a couple of try's, but be patient.
Dan in Calgary


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 Post subject: Re: How do you remove dried-up masking tape?
PostPosted: Apr Wed 24, 2019 4:11 am 
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Joined: Feb Fri 01, 2019 11:35 pm
Posts: 273
Location: Riverside Ca. 92504
I have had some luck with WD 40 , letting it sit on it over night. It removed some but not all. Tom


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 Post subject: Re: How do you remove dried-up masking tape?
PostPosted: Apr Wed 24, 2019 5:25 am 
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Joined: Aug Thu 06, 2009 12:20 am
Posts: 418
Location: Wheat Ridge, CO
Thanks - I'll try both. This tape is hard as granite!


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 Post subject: Re: How do you remove dried-up masking tape?
PostPosted: Apr Wed 24, 2019 6:54 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 33297
Location: SoCal, 91387
You might also try Naptha (lighter fluid). Works great on most adhesives.

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


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 Post subject: Re: How do you remove dried-up masking tape?
PostPosted: Apr Wed 24, 2019 12:02 pm 
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Joined: Sep Tue 30, 2014 6:08 am
Posts: 4863
Location: Norfolk, VA
fifties wrote:
You might also try Naptha (lighter fluid). Works great on most adhesives.


+1 . I use it all the time.

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"Capacitor Cosmetologist since 1979"
USN Retired 1984-2006 (Avionics/Cal)


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 Post subject: Re: How do you remove dried-up masking tape?
PostPosted: Apr Wed 24, 2019 12:45 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 10862
Location: Baguio City, Philippines
Rubber cement thinner (Bestine a common brand) from an art supply store works the best. It will quickly liquify and pressure sensitive adhesive any allow you to wipe it off. It's also handy to have on hand to remove price stickers and adhesive residue.


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 Post subject: Re: How do you remove dried-up masking tape?
PostPosted: Apr Thu 25, 2019 12:12 am 
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Joined: May Wed 03, 2006 4:47 am
Posts: 5398
Location: Radio Heaven, North Carolina, near Charlotte, 28106-3015
I would not put any chemicals on it, use a blow dryer, the heat will
soften the old adhesive and the tape will lift right off.
I've used this method many times and it's worked every time.

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http://radioheaven.homestead.com/menu.html


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 Post subject: Re: How do you remove dried-up masking tape?
PostPosted: Apr Thu 25, 2019 1:53 am 
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Joined: Aug Thu 06, 2009 12:20 am
Posts: 418
Location: Wheat Ridge, CO
Thanks for all of the good and helpful suggestions. However, unfortunately, none of the suggested materials and procedures worked. I've come to the conclusion that, when it comes to dried masking tape that has been in place on a painted metal surface for a long long time (decades), there is nothing that will take it off other than physical removal methods (scraping, etc.) Heat and chemicals just can't soften adhesive tape that has dried so hard that it's like cement. I think that some of the removal methods that were suggested along with others that I read about will work if the tape has not petrified over years and years. This must really be a difficult problem since I found literally dozens of suggested materials ranging from acetone to peanut butter to bug killer spray! In my case, I think that the problem was worsened by the fact that the tape was on the power transformer and went though an untold number of heating and cooling cycles which probably further petrified it.

I did get the tape off. How? I sat down for over an hour and carefully picked off tiny fragments of the tape bit by bit with my fingernail until it was all gone. It kind of wore-down my nail a bit, but it needed to be trimmed anyway. :) I was very very lucky in that the paint on the transformer turned out to be really strong and none of the paint came off as a result of my "picking".

Anyway, thanks again for the suggestions, but I think that this is a problem which is still in need of a solution...


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 Post subject: Re: How do you remove dried-up masking tape?
PostPosted: Apr Fri 26, 2019 12:16 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 3479
Location: Massachusetts
how about mayonnaise, apply and let soak in.


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 Post subject: Re: How do you remove dried-up masking tape?
PostPosted: Apr Mon 29, 2019 4:08 am 
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Joined: Feb Tue 10, 2009 3:16 pm
Posts: 847
Location: zipcode 46235
White gojo hand cleaner


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 Post subject: Re: How do you remove dried-up masking tape?
PostPosted: May Sun 05, 2019 4:09 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 1529
Location: Earth
Nu Finish liquid auto wax in the orange bottle.

This will wear down the remains of the tape while shining up the paint without excessive chemical or abrasive fallout.

Use an old sock and gently and slowly work away at the tape.


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 Post subject: Re: How do you remove dried-up masking tape?
PostPosted: May Tue 07, 2019 12:09 am 
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Joined: Feb Thu 08, 2007 2:32 pm
Posts: 12539
Location: 06457
WD-40, nothing does it better. :)


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 Post subject: Re: How do you remove dried-up masking tape?
PostPosted: May Wed 15, 2019 3:42 pm 
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Location: Eschew Obfuscation Virginia 23005
mrx wrote:
how about mayonnaise, apply and let soak in.

+1
I've used mayonnaise for years to remove adhesive items (tape, labels, etc.) from radio cabinets.

BR,

Terry


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 Post subject: Re: How do you remove dried-up masking tape?
PostPosted: May Wed 15, 2019 5:08 pm 
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Joined: Apr Wed 03, 2019 6:41 pm
Posts: 100
Location: Raleigh, NC
mayo is just vegetable oil and egg yolks. i doubt the egg does anything good here so why not just use vegetable oil?


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 Post subject: Re: How do you remove dried-up masking tape?
PostPosted: May Wed 15, 2019 6:34 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 33297
Location: SoCal, 91387
Raleighcopter wrote:
mayo is just vegetable oil and egg yolks. i doubt the egg does anything good here so why not just use vegetable oil?

Egg yolks or egg whites?

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


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 Post subject: Re: How do you remove dried-up masking tape?
PostPosted: May Wed 15, 2019 11:18 pm 
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Joined: Apr Wed 03, 2019 6:41 pm
Posts: 100
Location: Raleigh, NC
Yolk.


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 Post subject: Re: How do you remove dried-up masking tape?
PostPosted: May Wed 22, 2019 11:08 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 826
Location: Crossville, TN USA
Mineral spirits.


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 Post subject: Re: How do you remove dried-up masking tape?
PostPosted: Jun Fri 07, 2019 7:40 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 4541
Location: Charleston, W.Va.
I have been following this thread since its beginning. Like many others here in the ARF, I have often had to deal with old dried-out masking tape residue on radio cabinets and/or components. This is one of most difficult problems anyone can encounter. Almost every possible solvent has been mentioned previously in this thread. I have tried most of these; sometimes these various methods will work, quite often they will not.

In the end, my experience has been exactly the same as that of artdecoradios: It is virtually impossible to remove the residue from old dried-out masking tape without damaging the finish beneath it. And even when the finish beneath it is bare metal, it is still difficult to deal with.

This should teach all of us a lesson: NEVER use conventional masking tape in an antique radio for any reason whatsoever! Even if used for temporary purposes, you may forget about it and by the time you want to remove it the damage is done. A far better choice is blue "painter's tape", preferably a good name brand such as 3-M or Scotch. This is easily removable and leaves very little residue. What small amount of residue that remains can easily be wiped off with mineral spirits.

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Poston


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 Post subject: Re: How do you remove dried-up masking tape?
PostPosted: Jun Thu 20, 2019 11:24 pm 
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Joined: Feb Fri 27, 2015 3:19 pm
Posts: 54
I would try warm or hot water first as it is the safest instead of going to chemicals. Try covering it up with a thick towel to keep the temperature high and then I would try a hair drier but making sure the surrounding components don't get heated up. Maybe doing some fine cuts on the paper with razor blade first to allow the water and then the hot air to penetrate. Also, silicone does a fine job but the problem is that it does not come off, even though it may look otherwise, unless you resort to harsh chemicals which nowadays you may not be able to get due to terrorism suspicions. If you go the solvent way, choose anything that does not evaporate quickly or you will have to cover it completely with a towel.


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