plastic tank stains

[454MRW]

If you plan on painting the tank, you should thoroughly rinse the inside with lacquer thinner several times and follow up with a dying agent like MEK or Acetone and seal the inside with Caswells first. Dave McCullough told me he had good results with a new Clarke GS-6 plastic tank using Caswells to seal the inside. If the inside of the tank is properly sealed, it will stop the fuel from migrating through the plastic and decals and paint will not bubble and peel off. I Had my 1980 KTM tank primered and painted by my local body shop with proper adheshion components, but I plan on sealing the inside with Caswells before ever putting gas in it, or it will eventually bubble and peel off. Mike

Michael R. Winter
I enjoy rebuilding and appreciating Pentons!
1974 250 HS Pentons-1980 KTM 175-400'S

[Mike Hufnagel]

Michael,


Is the Caswell pliable? and is there a name for their product? I went to a site that was called "caswell plating....." Is that it? Seems that they had a bunch of products.

[454MRW]

I believe it is somewhat flexible, but you will have to inquire to be sure. Dave may chime in about his most experience with his GS6 tank and how it is holding up so far. Here is a link to the Caswells tank sealer. Mike
http://www.caswellplating.com/aids/epoxygas.htm

Michael R. Winter
I enjoy rebuilding and appreciating Pentons!
1974 250 HS Pentons-1980 KTM 175-400'S

[chicagojerry]

caswell is NOT pliable. its an epoxy that gets hard as a rock. i used to believe that it was the way to go. but despite great pains to ensure proper application, it will still allow fumes to bleed through that will ruin a great paint job. i drain the gas from my lined and painted tanks.  mike winter, are you still satisfied with the por-15 process?    chicago jerry

[Mike Hufnagel]

Sounds like it would just be easier to get the cover. I have a lot of HOK paint laying around.    Hmmmmmmm, may be I could paint the tank cover glow in the dark.

[454MRW]

Jerry,
On fiberglass tanks I still think POR-15 Clear is the way to go. I will never drain another tank. It is not for use on plastic however, but would work well on metal tanks as well. Mike
Just FYI, after ready many horror stories on the PE Suzuki and TM/RM Suzuki group sites about plastic tanks splitting and cracking because of drying out from sitting without fuel, I don't recommend completely emptying plastic tanks, originals at least. A small amount of fuel or fuel/oil mixture in the very bottom of the tank will keep the plastic from drying out and cracking when refilled, even on the shelves. NOS tanks that never even had gas in them also. I plan on soaking/submerging any of my unused Suzuki and later KTM plastic tanks in a fuel oil mixture for a few days before using them to allow both the inside and outside of the tank to contract or expand at the same rate to avoid this problem, hopefully. Nice original tanks are getting just to hard to come by. Mike

Michael R. Winter
I enjoy rebuilding and appreciating Pentons!
1974 250 HS Pentons-1980 KTM 175-400'S