17th May 2022 How does the SK800 Shadowline System compare to the traditional P50 system? The SK800 Shadowline System halves the install time compared to the P50 system because with the Shadowline you only need to install the actual skirting boards. The traditional P50 system involves installing a top piece as well as the skirting boards, adding additional time and money to you installation. The SK800 Shadowline system will save you money in installation time.