Bubbles will disappear on warm days as the vinyl heats up!
Contact adhesives dry by “flashing off”. The installation procedure involves applying a thin coating
of adhesive to one surface (i.e. top of plywood deck), let dry completely then coating the other
surface to be glued (i.e. back of membrane), letting it become tacky and then contacting the two
surfaces. The bond strength comes when the molecules of glue physically and chemically mesh
together. This is a rapid but not a uniform process. Pockets of still wet solvent adhesive can be
trapped under the now partially adhered membrane. These pockets will now take longer to flash off
and can cause a “gas bubble” to form.
Many of these gas bubbles will vanish as the adhesive dries. Applying heat to the top of the
membrane can temporarily soften Duradek contact adhesives so the bubble will stick down to the
plywood. The solar heat from the sun does this naturally, but this process can take time depending
on the season. Other methods are quicker and can often be done by the owner, they include:
stepping on the bubble with a slight twist, use a hair dr yer set at a medium heat, clothes iron and
damp towel slip sheet, pouring hot water over the bubbles.
Concentrated or too high of a heat setting could glaze the membrane finish. A plastic spreader can
be used to evenly force the membrane down.
Only a qualified installer should apply direct heat using a Hot Air Welding Gun or Directional Forced
Air Space Heater