So the tank is Kreemed and curing at this point for the next 4 days. I'll head up and put some gas in it Wednesday.
Thought I'd just report on the experience.
MCRider is spot on with the FIP fitting and I couldn't find a freeze plug that big at my local auto store so Ace came through with a 50mm rubber plug. Worked like a charm.
I posted a couple of questions about plugs and the final results here and here
http://forums.sohc4.net/index.php?topic=60187.msg652697http://forums.sohc4.net/index.php?topic=59984.msg650338Second post has some info on Kreem's ability to hold up to various alcohols and the first asks if I did it right. Mostly nobody knows
The process is pretty tedious but here's the rundown.
Tank Prep A - Phosphoric Acid
Since I'd already run the works through it the tank was reasonably clean to begin with so I dropped the Tank Prep in for a half hour all by itself and swished it around then filled it up to the spout with hot water for 3 more.
Level off the tank since it'll start producing gas (hydrogen?) and will spill acid on your paint when it burbles. Ask me how I know
The visqueen is in case it started leaking - which it did. Came through the permatex in about an hour. Kind of a losing proposition filling it back to the spout as the acid just gets weaker and weaker. Three hours looked to be enough for me. I hope.
The acid will clear up the tank right nice but the spout end still ended up with some flash rust on it. It will wipe right off with some vigorous rubbing though.
Tank Prep B is MEK and exceptionally nasty. Maybe 3-5 minutes swishing it around with the tank plugged then out the petcock and the rest out the spout.
One thing I wished I'd ordered in retrospect is the tank mask.
Ended up with some streaks I think'll rub out and I had waxed it up prior to starting the job but still would have been nice to have on hand I think.
Once the MEK is out it's straight on to the liner immediately - jam in the plugs and start slowly turning. Instructions are to coat the inside, unplug the spout, let it sit 8 - 10 minutes, coat the inside, unplug the spout, let it sit on another side 8 - 10 minutes etc etc etc. I went at it for 3 hours drained off about a 1/4 inch of liner back into the 16 oz container and this is what I saw.
Kind of worrisome as I expected it to be all white. Asked the board and the answer is no one really knows. Might have borked the cleaning. Might be fatally flawed. Might need a second coat but I ended up dumping the dregs back in which was just enough to skim the bottom again so 16oz seems to be just enough for a 4.25 Gallon tank.
Overall, the RedKote/POR-15 folks may have a point I think. Nicer to KNOW that your liner has created some serious molecular bond with your tank rather than a handshake. Time will tell.