Re: Reupolstering boat seats.
i actually found i like sewing... it was just different....
once i finish the boat I am going to make a radio control teradactyle (flying dino) with very light ripstop for the wings
ok back to topic at hand, since we didnt have any pattern to follow we used the plywood seats as the template, we then added 1 inch to allow for the seam, and then since we had 4" high density foam we added 1 inch for the seam and added 3 inches to allow us to pull over the plywood and still have 2.5" to staple to the seat bottom. for ea corner there was a seam for the top to the side and for the side panels to connect to. Since i used polyester canvas with PVC backing (kind of like vulcanized canvas) I chose to use outdoor polyester thread (i was later told that polyester uv stabilized thread is the correct thread to use but that it kinks and is harder to sew with than nylon upolstery thread.) After a few scraps for practice it was off to the races since the scraps were strong enough that i could not get the seam to fail by tugging pulling or twisting.
I was then taught that after the sewing that the seams must be flattened (by iron)so as not to get in the way, and that one side should be trimmed a little shorter than the other, and that it lays nicely if it unflattens its self. I was also taught that you must trim the leftover material from the seem in any 3 way corner.
hope this helps