I usually get a solid core door and use the foam sealer all the way around the outer frame. then I use those thick bottom door guards and use the weather seal foam tape around the gaps.
without the frame and the solid door, its a pickle to seal, but possible.
Thanks Waxy! I was going to go with he thicker foam sealer, but went with the rubber ones cause they're more expensive (thinking that they would seal better). I'm assuming that your door has hinges and its opening towards the grow? Mine is altered where my door is on the outside with handles and closed tight with deadbolts. I did it this way so I can use max space in the grow room and the door wouldn't run into any plants when I open it, but maybe that's the downfall of the design. I'll try the thicker foam sealer and if it doesn't work I'm gonna have to put the door on the inside like a traditionalot door. Thanks again!!!