/gulag/ - gulag

I need to break a glass, and send burning material to the other side.
I think in something as shown in the image.
A Molotov or chemical fire bottle taped to a pipebomb.
the idea is that the pipebomb explode, put the chemical fire bottle on fire, and break the glass.
But idk if the fire will dispersate itself before it pass through the broken glass.
I Have to take down a couple of cars and a little building. To cars I think in just put thermite in the roft, and let it burn.
The building is the problem. Is needed to break the glass and insert the burning material with just one explosion. (cause I need to turn it on and has at least 10/20sec of fuse time)

Opinions?