Buy a Sevylor High pressure 12v. pump. Set the resssure (3.6 for my Quicksilver) and moments later it shuts off at the perfect inflation point. 10psi for the floor easily handled too. Inflates my Drop stitched, high pressure Sea Eagle Kayak in minutes too. Manual pumping is a chore...Especially if you have to hit 10 psi. Under $50 on Amazon. Great little pump..
https://www.amazon.com/Sevylor-15-PS...s=sevylor+pump
Getting ready to order a Portland Pudgy though...I've had it with Blow-ups..
http://www.portlandpudgy.com/