The present invention is directed to tissue sealant compositions comprising: a multi-arm reactive polyethylene glycol polymer having at least 3 electrophilic groups； albumin； a buffer； water； and entrained gas as bubbles； wherein concentration of albumin in a liquid component of the sealant is within range of 50-200 mg/ml； and wherein concentration of multi-arm PEG in said liquid component of the sealant is within range of 25-100 mg/mL.
