Mergal S 90 Troy Preservatives / Biocides / Fungicides ADHESIVE SEALANT Mergal S 90 Fungicide/algaecide A systemized approach to dry-film protection, Mergal S 90 imparts a full spectrum of biological control including pretection from common species of fungi and algae that cause unsightly marring and shorten the life of exterior applied cauks and sealants. Mergal S 90 is VOC-free and color stable. VOC-free, color stable fungicide/algaecide. Used for dry-film protection in adhesives and exterior applied cauks and sealants. Provides full spectrum of biological control including pretection from common species of fungi and algae.