3M Hi-Temperature Polystyrene Insulation 78 HT Spray Adhesive Blue Foam 28.5 lb Cylinder - 315943M Hi Temperature Polystyrene Insulation 78 HT Spray Adhesive Blue Foam 28. 5 lb Cylinder 31594 051115 31594 3M 78 HT blue Hi Temperature Polystyrene Insulation spray adhesive with a 60 minutes cure time. Comes in a 28. 5 lb Cylinder. This spray adhesive is packaged 28. 5 lb per inner, 1 per case. Product Specifications Brand: 3M Series: Hi Temperature Polystyrene Insulation 3M Number: 78 HT Color: Blue Product Form: Foam Package Type: Cylinder