Air leak around the walls? We're painting and lifting up the trim along the walls. It seem...

We're painting and lifting up the trim along the walls. It seem like within are some bad spots bringing up the rear the trim that the air is flowing right contained by. What's the best caulk to stop up these leaks? Is in that some sort of other way to stop them up? All answers are ably appreciated.
How can I set out my bathroom.?
The answer about the foam stuff is great. Talk to the man surrounded by Home Depot...he will guide you to the right stuff for your needs... virtuous luck..have fun making your home stove!!

Restoring color to paving stones?
There is a kind of foam that expands after it is released from the pressurized can it comes surrounded by.. It did a good livelihood of sealing the floors and ceiling in one of our houses. I'd suspend to use it at electrical outlets unless I knew it be non-conductive and not prone to fire. It comes with a short time tube that allows you to put it into cracks and crevices. I don't know a brand name, but I've see it at home improvement departments and hardware stores.

You can also achieve little foam pads that dance under electric outlet cover plates to stop infiltration here.

Good luck.
How much would this cost and where on...
Answers:    Be careful if you use spray foam. It can expand and effect windows to bind up or break things. If the gap are 1/4 inch or smaller use a siliconized acrylic caulk. Do not use 100%silicon caulk. If it gets where on earth it shouldn't be, you can't paint over it. Bigger gaps can be caulked but you will enjoy to use a foam backer rod underneath the caulk.