The fleet is getting along in years and the original supplied foam seating/berths cushions from Taiwan builders has probably been replaced by many of you. For those in need of more support and comfort I have finally run across my old reference to what I replaced in the 1988-built Seeker about May of 2001 for all seating except the forward berths where it was unneeded.
I wanted more support with new covers so a local marine canvas specialist knew exactly what would work. It is called HR Foam and I chose 6" thick foam rated at 2.5 lbs/square foot density per his recommendation. This gives solid support and comfort. The new covers' material was BURCH FAIRFIELD BUFF #66 266346, a tan that complemented the teak interior very well and has the side benefit of closely resembling Ultrasuede without the cost. Button tucks were taken in it in the saloon to relieve flat expanses. A back slope was used in the PH, 6" to 4" for comfort. Sewing was with a durable synthetic, not like the original cotton in Ho Hsing's builds.
Sun and its heat are big factors in upholstery deterioration in a boat. There just aren't any covered slips in SoCal marinas. I also at the same time had custom white 90% plasticized inside screens with corner snaps made for each window, with the forward PH windows and their two side-forward windows made as a single screen. The paper templates made by the installer were perfect and the screens fit perfectly each window. As shipwrights follow bulkheads, no two side windows were quite exactly the same so the installer sewed a small piece of suede leather in an upper inside corner which I marked with black magic marker as LPHD, for example, for the Left Pilot House Door window, etc. Only the PH doors' glass required outside screens rather than inside screens, and high winds were never a screen retention issue. These 90% screens allowed at the dock outside visibility during the day and privacy at night. They also lowered the inside PH temperature by a measured 10-15 degrees f., remarkably increasing dockside comfort.
I had at commissioning installed adjustable retained venetian blinds in the saloon side windows, so these needed no screens..
I never understood the guys who use black 70% window screens on their power boats in SoCal waters. They just soak up the sun's heat and are a bird attractant to sloped windscreens. Boat covers of dark blue or black also heat a boat unmercifully and are to be avoided. Big footed sea birds aren't dumb, and roost on dark colors heated by the sun, and you know what that produces.
Doug Robertson ex SD32/162 SEEKER