First, I have to qualify this since you Yanks build basements funny. Here most basements are built into a hill and are often called daylight basements. So this may not work for you cave dwellers.
I have been outside spraying some really nasty smelling poly on two kayaks. It's late and I am supposed to take these to the water tomorrow so I had to move them inside to spray one last coat.
I have tried and tried but I can never seal all the holes and in our bathroom we will get some smells from the shop despite all the expanding foam. This stuff smells like the old model airplane glue and I knew I had to do something. I looked around the shop and had an idea.
I set up a squirrel cage fan in the door and blocked off the open space with some plywood and set it up to pull air out of the shop. Closed all the doors and windows and NO SMELL! It is obviously creating a vacuum in the shop pulling air out of the house thought those leaks that were allowing the smells in. This has worked so well I am going to figure out a way to mount the fan to window and easily latch and remove it!