Cromar Bubble Buster Laminating Roller 225mm x 45mm - Pack of 5 Description Ribbed metal rollers for consolidating and distributing resin into CSM to ensure on even and correct resin to mat ratio (3 to 1) and to remove any air bubbles from the laminate. Uses Using the laminating roller, apply light pressure to the wetted mat using long even strokes, making sure that the whole area of the mat is worked until transparent. Any area that is white or opaque will require more resin applied. Continue until the whole flat area of the roof is laminated and consolidated.