MicroPrep is a surface treatment applied to a difficult to bond surface (Delrin, Celcon, etc.) prior to bonding and/or painting.
MicroPrep has a shelf life (2 years) and is affected by temperature.
It is best to keep it sealed tightly as it will evaporate when opened.
Store in a cool place. The 1.5-ounce bottle is partially filled because the spray attachment needs the extra space.
If storing for any length of time, please remove the sprayer and re-insert the yellow seal to extend shelf life.

Microscale Instruction Sheet:
http://www.microscale.com/Merchant2/graphics/Instructions/MBondSysteminstr.pdf