Lexan

COLIN LAMB wrote:
I think it was "Goof Off" that I used on Lexan and it did craze the
material. Get a spare piece and try it out first. Crazing a canopy or
windshield youself is something that grown men cry about.

After I crazed the material, I got a 3 part plastic refinishing system from
Sears and eventually polished it all up.

I have small sheets of old acylic with the brown paper still on after about
15 years. So, it does not want to come off. In my case, I put in in the
sink with warm water and detergent and it eventually comes off. So, I
suspect the soap suggested by Denny is probably the best solution.

Naptha may also work. As I recall, the ingredients are not published, but
it may not be petroleum based. It is a great cleaner for camera shutters.

Colin



What Colin said - ESPECIALLY if there is any curvature in the plastic.

The stuff really crazes quickly when stressed.

Flat sheet may not craze as quickly - but it will eventually.

Richard

cavelamb himself wrote:
COLIN LAMB wrote:
I think it was "Goof Off" that I used on Lexan and it did craze the
material. Get a spare piece and try it out first. Crazing a canopy
or windshield youself is something that grown men cry about.

After I crazed the material, I got a 3 part plastic refinishing system
from Sears and eventually polished it all up.

I have small sheets of old acylic with the brown paper still on after
about 15 years. So, it does not want to come off. In my case, I put
in in the sink with warm water and detergent and it eventually comes
off. So, I suspect the soap suggested by Denny is probably the best
solution.

Naptha may also work. As I recall, the ingredients are not published,
but it may not be petroleum based. It is a great cleaner for camera
shutters.

Colin


What Colin said - ESPECIALLY if there is any curvature in the plastic.

The stuff really crazes quickly when stressed.

Flat sheet may not craze as quickly - but it will eventually.

Richard

Re; Naptha----Naptha is a petroleum distillate--a narrow range of
molecules taken from crude petroleum--usually in a fractionating
(bubble) tower.

Just a thought. If heat put it on, won't heat help take it off?
Lou

"Lou" wrote in message
oups.com...
Just a thought. If heat put it on, won't heat help take it off?
Lou


That's my understanding (Hair dryer - not a heat gun)

--
Geoff
The Sea Hawk at Wow Way d0t Com
remove spaces and make the obvious substitutions to reply by mail
When immigration is outlawed, only outlaws will immigrate.

On Mar 26, 5:56�pm, "erik" wrote:
Listers, I need help, please.

*About three weeks ago I had to push an airframe that I was working
on, out into the open for space requirements. The windshield was
intalled on this airframe, but still covered in the protective plastic
"masking" to prevent scratching.

Now, after three weeks in the sun, the masking has deteriorated so
much that I can't get it off the lexan. It has perished into milions
of 1/4 mm square pieces that seems bonded to the lexan.

I have unsuccessfully tried: hot water and soap, turpentine,
meths,spit, scratching with my fingernails (works to an extend, but
leaves tiny scratches on the lexan surface. Can these be polished
out?), thinners (ginormous mistake).

I have not tried acetone (I forsee another ginormous mistake), or fire
(match in the fuel tank). Or Handy-Andy, an ammonium-based deterdent.

Any suggestions will be tried. This is driving me off my rocker.

Thanks and goodbye,

Erik Snyman

Go to www.charliesoap.com and order a gallon of Charlie's Soap. I
have used it several times to clean plexiglass in the same condition.
You won't need anywhere near a whole gallon, but you will find so many
other uses for it, you will want more than a quart. It cleans
everything from false teeth to diesel engines, according to the
label. I haven't used it on false teeth, but it cleans everthing else
I've tried it on.

Denny

There is a product designed specifically for this purpose. It is called
DSR-5. It is a clear liquid, and it comes in pint spray bottles. It works.

I have a kit plane that sat outside in Florida for several years after the
original builder gave up on it. The lexan coating was rock hard and totally
impossible to get off. A few squirts of this stuff and it was coming off in
foot square sheets.

http://www.dsr5.com/





Now, after three weeks in the sun, the masking has deteriorated so
much that I can't get it off the lexan. It has perished into milions
of 1/4 mm square pieces that seems bonded to the lexan.

I don't know for certain it'll work for you, but I've used two of the citrus
oil based adhesive solvents and they both work well in removing sticky
labels and the adhesive used on them. The two brands I've successfully used
are "Goo Gone" and "De-Solv-It" and I've never had either harm plastic or
wood surfaces I've used'em on.

Harold
KD5SAK

"erik" wrote in message
ups.com...
Listers, I need help, please.

About three weeks ago I had to push an airframe that I was working
on, out into the open for space requirements. The windshield was
intalled on this airframe, but still covered in the protective plastic
"masking" to prevent scratching.

Now, after three weeks in the sun, the masking has deteriorated so
much that I can't get it off the lexan. It has perished into milions
of 1/4 mm square pieces that seems bonded to the lexan.

I have unsuccessfully tried: hot water and soap, turpentine,
meths,spit, scratching with my fingernails (works to an extend, but
leaves tiny scratches on the lexan surface. Can these be polished
out?), thinners (ginormous mistake).

I have not tried acetone (I forsee another ginormous mistake), or fire
(match in the fuel tank). Or Handy-Andy, an ammonium-based deterdent.

Any suggestions will be tried. This is driving me off my rocker.

Thanks and goodbye,

Erik Snyman

On Mar 26, 9:56 am, "erik" wrote:
Listers, I need help, please.

About three weeks ago I had to push an airframe that I was working
on, out into the open for space requirements. The windshield was
intalled on this airframe, but still covered in the protective plastic
"masking" to prevent scratching.

Now, after three weeks in the sun, the masking has deteriorated so
much that I can't get it off the lexan. It has perished into milions
of 1/4 mm square pieces that seems bonded to the lexan.

I have unsuccessfully tried: hot water and soap, turpentine,
meths,spit, scratching with my fingernails (works to an extend, but
leaves tiny scratches on the lexan surface. Can these be polished
out?), thinners (ginormous mistake).

I have not tried acetone (I forsee another ginormous mistake), or fire
(match in the fuel tank). Or Handy-Andy, an ammonium-based deterdent.

Any suggestions will be tried. This is driving me off my rocker.

Thanks and goodbye,

Erik Snyman

To all the listers that offered solutions to my Lexan problem, a big
thank you! I will try them all until something works.

To the guys that kindly offered to crank up the washer pressures for
me.... thanks, guys. I should have mentioned that I live on the other
side of the world....South Africa.

Regards,

Erik.

On 28 Mar 2007 01:13:15 -0700, "erik" wrote:

To the guys that kindly offered to crank up the washer pressures for
me.... thanks, guys. I should have mentioned that I live on the other
side of the world....South Africa.

800 PSI ain't quite going to do it, then. :-)

Ron Wanttaja

"Ron Wanttaja" wrote in message ...
: On 28 Mar 2007 01:13:15 -0700, "erik" wrote:
:
: To the guys that kindly offered to crank up the washer pressures for
: me.... thanks, guys. I should have mentioned that I live on the other
: side of the world....South Africa.
:
: 800 PSI ain't quite going to do it, then. :-)
:
: Ron Wanttaja


Yea, maybe just turn it up to 55 bar instead!

;-)