Pest bombs

I need to bomb the garage for spiders creepy crawlies so that we can empty it out without fear of redbacks, whitetails or huntsman.

I have two raid bombs which is enough to do the garage (6mx6)

But my problem is the internal door from the garage to the house.
It has a weather seal on the bottom and I'm surface spraying all around it but I have images of spiders xrawling thru horror-movie style as soon as the bombs start to work.
That and whether the fumes can get in and would cause a problem

Has anyone used these before?
Any suggestions?

You could use a door snake to seal up the crack, or if you have a surface spray barrier, if they crawl across it they will die anyway.

TBH we've had a very badly infested house sprayed (by an exterminator) and the spidies didn't travel much, just curled up and died. The ****roaches (speaking from my tropical ****roach-infested Darwin days) are the ones that travel, but even so they don't get very far before they cark it. Just be ready to vaccuum up some corpses afterwards

ETA - if we're using pest sprays anywhere on the property we vacate the whole place for as many hours as possible afterwards, to allow the fumes to subside.