First time DIYer – what kit should I buy for a crawl space?

Froth-Pak is solid for DIY. For a crawl space that size get the 650 board foot kit, maybe two. Do not forget safety gear – respirator, safety glasses, and gloves are non-negotiable.

Practice on cardboard first. The learning curve is real. Your first few passes will likely be uneven. Do multiple thin passes rather than one thick one.

55F is borderline. Ideally substrate should be above 60F. Run a space heater in there for a few hours before you start. The tanks should also be 70-80F for proper mixing.