Yes I used a etching primer and  painted with some enamel. Not sure what kind. It’s been a few years ago. I was pretty good at it after painting the stopped up one first and having to drain it and ship it back. 
The upper side is where most trash collects and rust starts. Do a especially good coating up there. 

Bob

1986 Syncro ‘Bullet’
1991 WESTY ‘Sylvan’

> On Sep 10, 2022, at 18:08, Eric Caron <ericcaron96@comcast.net> wrote:
> 
> Thanks for the tip.
> 
> I blew through all the inlet and outlets.  Small ones have some resistance but I expect is correct as they were the same.  Outlet was very clear. 
> 
> Did you  undercoat or paint your new tank before installing?
> 
> Eric Caron 
> 85 GL Auto 
> Still gathering parts for the gas tank project.
> 
> 
>> On Sep 9, 2022, at 8:18 PM, Mbob1950 <mbob1950@GMAIL.COM> wrote:
>> 
>> Make sure the opening for the fuel return is open into the tank. I got one that was caped off in side and blew the return pipe off when I first started it. They sent me another one that was good. 
>> 
>> 
>> Bob
>> 
>> 1986 Syncro ‘Bullet’
>> 1991 WESTY ‘Sylvan’
>> 
>> 
>>>> On Sep 9, 2022, at 14:27, Eric Caron <ericcaron96@comcast.net> wrote:
>>> 
>>> So, the Spectrum gas tank arrived.  It seems solid and undamaged. Packing was minimum so I’m pleased it seems fine. 
>>> 
>>> I’m wondering if folks think it is important to prep the exterior in any way?  Undercoat, paint, wax? Or, does it matter as the interior will fail before the exterior?
>>> 
>>> How to pressure test? 
>>> 
>>> I’m still waiting on the soft parts that are needed to complete the refresh so won’t be doing the change until I have everything.
>>> 
>>> Tips on tank prep appreciated.
>>> 
>>> Eric Caron 
>