: has anyone every build a kayak seat with the blue or pink 2" foam that
: thy sell at home depot or lows? if so how did you do it? thank you marc

You can buy foam in 1 inch or 2 inch thick sheets. If you use the thinner stuff you can laminate several pieces to get the desired thickness. Use a construction cement like liquid nails which specifically says it will work with these foam panels. Some adhesives will just dissolve them.

To fit your foam to the curve of the hull, use a temproary adhesive, like rubber cement, to hold one or more sheets of coarse ( 60 to 80 grit) sandpaper to the inside of the hull where you want your seat. Apply this with the grit up. Cut a block of foam that is a bit larger than you want your seat base to be (you can trim it back later) and position this over the sandpaper. Now slide the block back and forth in 1 to 2 inch strokes, in line with the keel, while putting some pressure on it. The sand paper will fairly quickly remove the excess foam, leaving you with a block that should fit the curvature of your hull at that point. Peel off the sandpaper and you can apply some velcro to the hull at that point for later attaching the seat.

If you paint the foam pieces you'll get a bit of additional resistance to later flaking. You can use a latex paint or epoxy resin. Alternately, get a piece of Lycra Spandex material, or a similar stretch fabric (look for the swimsuit fabrics as they have bold colors) from your fabric store and attach it to your foam seat. Lightly spray the seat with a spreay adhesive, like 3M's 77 spray adhesive, positon the fabric over the foam and stretch it slightly as you push it into and around all the curves. It should stick tightly. The ends of the fabric are glued to the underside of the seat, with excess fabric cut away.

Any flaking foam pieces should stay inside that fabric cover. The swim suit materials are modestly UV resistant, and certainly designed to be used in water. They'll block enough UV fromt he foam to prevent it from damage for years. When you get tired of the color you should be able to just spray the thing with more glue and stick another piece of fabric right on top of the first. Or, jsut make another seat. the amterials are cheap enough.

Hope this helps.
Hope this helps