SONNEBORNE SONOLASTIC 150 - Sonolastic® 150 with VLM Technology is a premium, very low-modulus, high-movement, nonsag, fast-curing, ready-to-use, silyl-terminated polyether sealant. It combines the best qualities of organic and silicone sealants. It accommodates extreme joint movement (+100 to -50%) to keep moving joints weathertight.