Poly 74-40 15 Gallon Kit (120lb) gnomonworkshop Foam backfilling is recommended if

Foam backfilling is recommended if castings will be subjected to temperatures above 85°F / 30°C

All kits are vacuum tested for 24 hours before packaging

while warmer temperatures will reduce working times

sheet rock and smoothing edges of laminates

Single tips are used for gold leaf work

Poly 74-40 15 Gallon Kit (120lb) gnomonworkshop Foam backfilling is recommended ifPoly 74 40 Liquid Rubber is a two part, liquid polyurethane system that cures (RTV) to a Shore A40 rubber. This is a pourable rubber, but it can be easily thickened with PolyFiber II Thickener for brush on application. WARNING: This product can expose you to chemicals including Toluene diisocyanate (TDI), which is known to the State of California to cause cancer. For more information, go to www. P65Warnings. ca. gov. Technical Specifications Mix Ratio