A vacuum bag provides pressure and vacuum, which always results in a better quality laminate.

Pressure compacts the laminate, providing good consolidation and interlaminar bonds.

Vacuum draws out the volatiles and trapped air, resulting in a low void content. Both help to improve resin flow. 

The latest generation vacuum bags for ambient cure compete on cost with polyethylene sheet, but offer superior performance. 

 Bagging film is recommended that the peelply are stored in a cool and dry environment. Recommended temperature range of storage is between 10 - 30 centigrade and relative humidity between 50 - 75%. The peelply should remain in the packaging until just prior to use.