I'm sick of dealing with epoxy, especially after I found out JB weld doesn't hold up to ethanol!
I want a permanent fix. So I though about using a plastic welder to melt nylon rod onto the tank to fill the low spots, then sand flush.
Any thought? Bad idea? Good idea? Have I gone mad?
Update: Doesn't work
It sticks, but will still chip off if I pry at it. The problem is, in order for it to bond, the base needs to melt too. Too risky.
Is there ANY expoxy out there that will bond to plastic and resist ethanol? I don't want to spend $45 on a caswell sealer again when I just need to seal the flange. It would take maybe 2oz.
Last edited by jmccalip; 03-30-2012 at 03:42 PM.
Your problem is the tank isn't nylon, its fiberglass and that's a thermo-setting plastic which wont melt - it'll burn but not melt so it wont bond no matter how much heat you use.
The only thing you can use is more fiberglass resin in a roughed up and clean crack. If the crack is big you might need to use some glass filler
Chris
Probability factor now 1:1, normality has been returned. Anything you can’t deal with now is your own problem
The tank is Nylon 6, also known as PA6 or Polyamide 6, not fiberglass. The same as the tanks on 01 and up RSV, Tuono, KTM, and a large number of Ducatis. They are all rotational molded nylon tanks made be Acerbis. If the Falco tank was Fiberglass people would not be having the problems swelling due to ethanol in the fuel. Ethanol is hygroscopic, meaning that it actively pulls water out of the air. The nylon molecules in the tank then pick up and absorb water from the ethanol from the fuel and expand.Originally Posted by anzacinexile
2000 Tricolor, KTM Sprag, 16/43 sprockets, D.I.D. 525 Gold Chain, Rick's Stator version 2, RP collector modified with dual link pipes, Gabro F255 EPROM, Akrapovic slip on, Ohlins radial front forks, Falco clip-ons, 16mm Brembo radial brake master cylinder, Brembo four pad radial brake calipers, BrakeTech Axis ductile iron brake rotors, Integrated LED brake lights & blinkers, Ohlins rear shock with remote preload adjuster, Longer RS125 mirrors so I can see more than my shoulders and elbows.
Is nylon a true thermo plastic? I didn't think it could be remelted without losing some of the mechanical properties.
Yes, nylon is a thermo plastic.
I think I'm gonna try it again. Most of the surface was smooth when I tried it, and that's where it flaked. The part that was roughly sanded held so well I couldn't scratch it up.
And I found another use for zipties, haha! I found some 6-6 nylon zipties and I'm using them to melt onto the flange.
Bugger me, you learn something every day
Chris
Probability factor now 1:1, normality has been returned. Anything you can’t deal with now is your own problem
Handy to know about the zip ties, metal and plastic share one thing in common when being welded, the filler material has to be right
I knew nylon was thermally formed, but I had an idea it could not be reground and reformed as a 'true' thermo plastic can, there are a few plastics like that, nice to know I'm wrong
I bet waterproof liquid nail would work.That stuff sticks to anything and when hard gets rock like.
Originally Posted by Geedub/GeoR
Please, Dianne was England's most tragic mistake. Half of the time she called the papers herself so they could report she was shagging that Saudi billionaire's son and never mind the children, hey? Cunt.
A motorcycle is a joy machine. It's a machine of wonders, a metal bird, a motorized prosthetic. It's light and dark and shiny and dirty and warm and cold lapping over each other; it's a conduit of grace, it's a catalyst for bonding the gritty and the holy.
Once again I decided the plastic welding doesn't work. My gun does not get hot enough to bond mutiple layers together. OK for the first few, but not once I get past 1/8".
I ordered Devcon Flex-weld to use instead.
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