Description APOC #365 Eterna-Flash All Weather/All Season Rubberized Flashing Cement is a high performance flashing cement specially formulated for the professional roofer. APOC #365 provides superior adhesion to wet surfaces and easily bonds under water. Top performance in all weather conditions. Available in seasonal grades. Stock in 33.5 gallon pails and 10.1 oz. tubes - 1 gallon pails also available.