This week is the target for finally getting around to spraying my canvas top with some CANVAK treatment. It sounds like the garden sprayer is the easiest method to apply this - but I was wondering about a few details....

Do you spray it on or off the truck?
How to you prevent overspray on the truck and/or plastic windows? Will standard masking tape work?
Do you spray inside and out? (both sides of canvas?)
How long does it take to dry? (when can I put it back on the truck?)

Is there anything else I should know before I start on this?