Nothing will stick to polyethylene. I would use teflon tape, one healthy turn 
around the male fitting and it will last forever…

Micheal
S/V Tachyon

On Oct 29, 2012, at 12:00 PM, "larry dck" <[email protected]> wrote:
> 
> While winterizing my boat,35 MKIII, I noticed that the threaded elbow fitting 
> on the bottom of my white plastic  holding(waste)tank was loose and dripping 
> slightly.When the fitting wouldn&rsquo;t tighten up,I found the threads on 
> the elbow and in the tank looking tired.( stripped)I plan on trying a new 
> fitting,but intend on applying an adhesive/sealant to the threads when 
> installing. My first instinct is to mix up west epoxy with colloidal silica 
> and make a permanent connection of it. ...But then remembered some of that 
> white plastic can be very slippery,when it comes to epoxy adhering to it. I 
> am now contemplating 3m 4200 or even 5200 caulking instead. Anyone on the 
> list have some advice on this? This is a job I only want to do once if you 
> know what I mean. ThanksLarry S/V Sooner 1985 C&C 35 MKIII 
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> An

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