Loctite Stycast HD 3561 epoxy system is designed for use as a sealant or for potting electronic devices. It is specially formulated for LED display backfill applications. LOCTITE® STYCAST EE 4215/HD 3561 is a filled system recommended for potting applications where rigid or flexible wire leads protrude directly from the encapsulation and where high impact strength is required. This system eliminates microscopic cracking on flexing of leads. It adheres extremely well to lead materials, such as vinyl or neoprene.