Please do not put Fix a Flat in motorcycle tires. Or any tires, for that matter. It won't solve any problems and makes a flammable, disgusting mess. Most shops will refuse to work on a tire containing a sealer, or will charge extra to clean up the mess.
Your options are:
1) Monitor and reset air pressure at least weekly. You should be doing this anyway. Plus, 1-2 psi is well within the range of what's normal for most motorcycle tires. Motorcycle tires tend to naturally lose pressure a little faster than car tires. And bear in mind a normal pressure check on a motorcycle tire can bleed off 1/4 to 1/2 psi of pressure, so it's also normal to be a pound or half a pound low after checking a couple of times.
2) Remove the tires and clean the beads. Dealers and shops never bother taking the five minutes to clean the old rubber and any corrosion off the wheels before mounting new tires, and you can get quite an accumulation. When I started mounting my own tires, I always clean the beads and I found that my normal rate of air loss went way down. The first time through was horrible -- there was a lot of buildup in there. Of course, if you're having a shop mount your tires, you likely don't have the equipment and skills to do this, so it's sort of a moot point.
2002 Suzuki DL1000 V-Strom, Dark Metallic Space Blue
1983 Suzuki GS850G, Cosmic Blue
2005 KLR685, Aztec Red - Turd II.2, the ReReTurdening