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Discoloration under protective film

General building discussions, not model specific.
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akmillman
Posts: 108
Joined: Sun Aug 23, 2015 4:10 pm
Location: Dry Creek, Alaska

Discoloration under protective film

Post by akmillman » Fri Dec 04, 2015 9:51 pm

Was removing protective film from wing skin and small areas were difficult to get off. There seems to a white and grey discoloration on the skin. I easily sanded it off where it slides under the tank skin, but I sure don't want to do that anywhere else. MEK wouldn't touch it.

This has been siting around for 15 years.

Does anyone have an idea of what it is and what can be done for it

Brad

Expatnz
Posts: 152
Joined: Tue Oct 28, 2014 1:12 pm
Location: Richmond New Zealand

Re: Discoloration under protective film

Post by Expatnz » Sat Dec 05, 2015 7:35 am

It is the adhesive from the plastic. Very hard to get off. I use a heat gun when removing old layers and it comes off clean with no residue.

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Jerry Folkerts
Posts: 446
Joined: Tue Feb 21, 2012 5:57 pm
Location: Pagosa Springs, Colorado
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Re: Discoloration under protective film

Post by Jerry Folkerts » Sat Dec 05, 2015 4:44 pm

My Super Rebel sat in a box for 12 years in an uncontrolled environment. I did have a few spots where there was some very light surface corrosion. I simply scuffed with a 3M scotchbrite pad, cleaned and primed. If you haven't seen other posts, get yourself several different diameters and lengths of PVC pipe, it works great in removing plastic. Just work up a corner, wrap around the pipe, and start rolling. Much easier than pulling with your fingers.
Best,
Jerry
Jerry Folkerts
SW Colorado
SR 2500 #093
http://www.mykitlog.com/jfolkerts
http://www.thepedalrv.com

akmillman
Posts: 108
Joined: Sun Aug 23, 2015 4:10 pm
Location: Dry Creek, Alaska

Re: Discoloration under protective film

Post by akmillman » Sat Dec 05, 2015 5:44 pm

Jerry,

Does look like corrosion to me. When you refer to priming, is that before pre paint priming or some other priming. Do I try to remove now or wait until I'm ready to paint.

Thanks for the pipe tip

Brad

Elite773
Posts: 106
Joined: Tue Feb 21, 2012 11:35 am

Re: Discoloration under protective film

Post by Elite773 » Sat Dec 05, 2015 7:58 pm

Jerry Folkerts wrote: If you haven't seen other posts, get yourself several different diameters and lengths of PVC pipe, it works great in removing plastic. Just work up a corner, wrap around the pipe, and start rolling. Much easier than pulling with your fingers.
Best,
Jerry
Or you can get a length of steel rod small enough to be chucked in your portable electric variable speed drill.


Coastflyer
Posts: 438
Joined: Wed Feb 22, 2012 11:18 am

Re: Discoloration under protective film

Post by Coastflyer » Sun Dec 06, 2015 7:44 am

Could just be oxidation where the metal has been exposed to air where the plastic bubbled up. No problem, don't worry about it.
Jesse


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