Avoid pressure loss by applying E-gel to the packings
Apply E gel to both seals and connect the vacuum hose and vacuum pump . With the thumb screw in the vacuum position, press the vacuum tool against the surface and pump the vacuum to maximum. Check that the vacuum tool is sitting on the level rail.
Apply more E gel to the vacuum seals and re-position the vacuum tool and mould covering the damaged area, pump the vacuum again to maximum vacuum then release to 50-60% of maximum.