Answer:
It's more of a masking /repellent than a contact spray with no residual. Bedbugs are hardy. If you want a good aerosol, try ECOPCOACU or ECOPCOARX (acronyms)-they are both chemical free (plant/food oils) but kill them instantly. I've seen them on Ebay. The only diff is ARX has residual other doesn't. The tough part is the box springs, you should get a slipcover for the mattress set or consider replacing if they are inside or they could come back.