Removing caswell epoxy

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10 Aug 2020 10:12 #832564 by Greg Davis
Removing caswell epoxy was created by Greg Davis
Hi All, Ive got an kz1300, The tank was treated with caswell epoxy without attempting any rust removal
prior to coating (not me) I would like to remove the coating and use evapo rust remover. A little stumped
as to what to try. Any suggestions Thanks Greg

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10 Aug 2020 12:48 #832572 by M_a_t_t
Replied by M_a_t_t on topic Removing caswell epoxy
You might try electrolysis. I'm not sure how effective it would be against an epoxy liner, but it removes paint and rust.
kzrider.com/forum/11-projects/613536-1977-kz1000-ltd#830843

83 KZ1100A (shaft)
17 Versys X 300 abs
81 kz650h1
81 kz750e2
90 Honda CBR600F (brother's)
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10 Aug 2020 14:23 #832574 by Mikaw
Replied by Mikaw on topic Removing caswell epoxy
I used acetone to remove a botched coating job. I have no idea what brand of coating.

1976 KZ 900 A4 kzrider.com/forum/11-projects/613548-1976-kz-900-a4
1976 KZ 900 B1 LTD
1978 KZ 1000 B2 LTD
1980 KZ 750 E1
Kowledge Speaks, But Wisdom Listens.
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10 Aug 2020 14:46 #832581 by Scirocco
Replied by Scirocco on topic Removing caswell epoxy
No eBay APP ID and/or Cert ID defined in Kunena configurationI had good results with MEK (methyl ethyl ketone) aka Butanone, to remove old tank liners.

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10 Aug 2020 16:21 #832602 by Nessism
Replied by Nessism on topic Removing caswell epoxy
Man that sucks! Hacks shouldn't be allowed to work on bikes!

I'd try methylene chloride paint stripper and be prepared for a struggle. Something abrasive like aquarium rocks inside the tank will help scrub the surface.

GOOD LUCK!!!
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10 Aug 2020 16:48 #832608 by Shankkole
Replied by Shankkole on topic Removing caswell epoxy
I plug them, throw in a handful of stainless 1/4 nuts, and whatever super evil concentrate you want to use(MEK) or other. Cap ,then blue tape the entire Tank(glue cleans off with rubbing alcohol).Every 4 hours flip or rotate, re strap in and start back up. craigslist has baby swings( you may even meet a lonely young new mom and strike up a new friendship, or a new dad who is forced to sell his old motorcycle in back of the garage.)Hope this helps!
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10 Aug 2020 16:53 #832610 by ckahleer
Replied by ckahleer on topic Removing caswell epoxy
Unlike other liners, Caswell is epoxy. I would get one of those small dual tubes of clear epoxy and mix up a batch. After it hardens, try different stuff on it and find what breaks it down.

94 KE100
81 CM200t
82 KZ305
85 VF1100c
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10 Aug 2020 21:22 #832626 by martin_csr
Replied by martin_csr on topic Removing caswell epoxy
Just in case. Are you planning on a repaint? Because anything you use is likely to ruin the paint. but you probably already considered that.
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11 Aug 2020 05:57 #832642 by TexasKZ
Replied by TexasKZ on topic Removing caswell epoxy
If you are not familiar with MEK, you need to be very, very careful with it. Use it outdoors and be sure to wear gloves and goggles. Try to avoid contact or breathing the fumes.
I am not familiar with what Nessism recommended, but I would recommend serious caution here, too.

1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough

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11 Aug 2020 09:15 #832653 by Greg Davis
Replied by Greg Davis on topic Removing caswell epoxy
Yes A repaint was planned, The tank overall is in good condition. I'm just not comfortable with what looks like crushed cornflakes in the tank.
The bike was in storage in Washington for 30 years, Overall it is in remarkably excellent condition short of the fuel system being left with an almost
full tank of fuel that turned into shellac. The owner in an effort to restart rinsed it out with more corn fuel and then applied the epoxy coating
further gumming things up. I will take each and all replies seriously and try and remedy this. Once again Thank you All !!!!!!

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11 Aug 2020 10:05 #832657 by z1kzonly
Replied by z1kzonly on topic Removing caswell epoxy
Me, I used Caswell, so far so good. But I conditioned tanks before hand. I am a painter.
I would get a 5 gallon pail or basic wash lacquer thinner. ($65) Or 2 or 3 gal. cans Then fill up the gas tank with it. just let it sit for a few days. Lacquer thinner should bite into it.

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Went thru 25 of these in 40 yrs.
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