. Proceedings of the annual convention . 0 24 48 72 0 24 48 72 0 24 48 72 BEFORE AFTER 150 HRS. AFTER 50 CYS. WEATHERING WEATHEROMETER FREEZE 8 THAW HOURS OF IMMERSION IN WATER FIG. 2— EFFECT OF 2% ZnCl- 3% H^PO^PRETREATMENT ON THE WATERPROOFINGABILITY OF THREE DIFFERENT TYPES OFCOATINGS AS SHOWN BY 72-HR. IMMERSIONTESTS ON IX3X8-IN. COATED SPECIMENS. Tests on Waterp roofing Coatings 231 z 02 -4. UJ o z o CEMENT BASE COATING QO CYS. CEMENT BASE COATING :r O HRS^ H5^^ CEMENT BASE COATING ^RS. r—73 CYS.

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