It depends on how u do it.rexlim said::nono: :nono: :nono:
This is VERY dangerous!! It can cause back fire if the aerosol can IS defective!
Came across a news many years bk, some1 used this method on termites (infesting his house), suddenly the can jus EXPLODED in his hand! He ended up becoming "DU BI DAO" (Single-armed swordman)...
Of cos, make sure there is no backdraft in windage. Otherwise u'll burn ur hand instead. I kena once. :cry: