Not sure what you meant by plaster. If you're goingto hand balloons from a ceiling or beam it depends on what the celing or beam ifmade of. On metal you can use the MagPole system. Very cool and can hand small to large balloons. Air designs so it saves $$$. Some ceilings have that cross bar thing going on so you can get the clips that go right onto the beam.
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Has any one got any tips please. I have inflated my 24inch deco bubble, I put my vinyl on to personalise, but when I peel my transfer tape off, it marks