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9. Place the vacuum bag over the mold and seal it to the mold’s perimeter. Starting at a corner of the mold, peel the protective paper from the mastic. Press the edge of the bag firmly onto the mastic while pulling the bag taut enough to avoid wrinkles. When cutting the bag to size, allow enough excess bag material within the sealant perimeter to avoid stretching the bag or bridging areas when the vacuum is applied. It should be at least 20% larger than the mastic perimeter, or larger if it is a deep mold such as this one. 11. Seal the pleats of excess bag with a strip of mastic from perimeter mastic to the inside top of the pleat. then press the bag to both sides of the strip forming a continu- ous airtight seal. Repeat this procedure wherever there is a pleat around the mold. 10. Because the bag perimeter is greater than the sealant perimeter, you should create several folds or pleats of ex- cess material as the bag is sealed around the mold. Vacuum Bagging Applications 19 Perimeter mastic Pleat mastic 4PDF Image | Vacuum Bagging Techniques 002150
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