Seat foam?

Yes the original seat foam can be repaired. Whether it's the seat corners worn off or your dog chewed a hole in a snowmobile seat from being locked in the garage.

Can take some 1" or 2" high density HR foam and glue that down into the low spots and leave it overlap.

Once it has dried you can take an electric steak knife and easily trim it back to the original shape.

One good trick when sewing together seat covers is to use 1/2" Muslim backed foam on the back side of the top sitting surface vinyl to help it fill out nicely and that in turn covers over the foam repair imperfections in the process.

Some tricks to it to make it look nice like doing body work.

The burlap goes over the seat springs to help support the foam on top of it.

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