That's why they call it the "dreaded red liner".
Personally, I wouldn't worry too much if there was a bit of liner left before seasoning. But it sounds like you spray painted the interior? That's what got me.
Modded Brinkmann Gourmet. Basic UDS. Rescued 22.5" OTS. SJS Mini-WSM. Stubbs. B&B Oak Lump.
Cannondale 2009 F8 (for burning off all the great BBQ)