TABLE 1. Results of resin trials.

Resin and layer thickness Excessive heat produced during curing Colour when cured Appearance following acid treatments
Epo-tek301, 5 mm No Colourless Became soft and yellowed slightly, edges flaked away
Epo-tek301, 10 mm No Colourless Became soft and yellowed slightly, edges flaked away
Tiranti Clear Casting, 5 mm No Colourless Colourless, white bloom on surface.
Tiranti Clear Casting, 10 mm Yes Colourless Colourless, white bloom on surface.
Tiranti Clear Casting + UV stabiliser, 5 mm Yes Colourless Colourless, white bloom on surface.
Tiranti Clear Casting + UV stabiliser, 10 mm Yes Colourless Colourless, white bloom on surface.
Isopthalic Resin PA plus 1% catalyst, 5 mm Yes Amber Amber, severe white bloom on surface.
Isopthalic Resin PA plus 1% catalyst, 5 mm Yes Amber Amber, severe white bloom on edges.
Isopthalic Resin PA plus 2% catalyst, 10 mm Yes Dark Amber Amber, slight white bloom on surface.
Isopthalic Resin PA plus 2% catalyst, 10 mm Yes Dark Amber Amber, severe white bloom on surface.
Araldite 2020, 5 mm No Colourless Moderate yellowing and severe decomposition of form due to extreme softening. Remained flexible after treatment.
Araldite 2020, 10 mm No Colourless Moderate yellowing and severe decomposition of form due to extreme softening. Edges and flaked pieces are flexible.
Water White Clear Casting, 5 mm No Colourless Clear, colourless.
Water White Clear Casting, 10 mm No Colourless Colourless, slightly frosted in places.