[header] How to preserve leaves and flowers [title] Buy a fresh new can of clear polyester casting resin. [step] A container that has previously been opened may be difficult to open if the cap/lid is sealed tight with resin exposed to air. [substeps] Find out the date the can was bottled because resin has a short shelf life; even in sealed, airtight containers, it can become too viscous to effectively coat foliage and flowers. 
[title] Check the viscosity of the resin fluid. [title] Set up in an open-air area with plenty of ventilation and away from open flames.