Know what you are saying, those sprays are water repellant and make the water bead and run off but don't stop water being 'pushed' through the fabric. If I replace the floor then perhaps the new floor will start to leak in five years, so if I can find a fix then it should be possible to re dress the floor when needed. Also without the jigs / sewing forms it might be tricky to get the tent sides absolutely tight and flat again.
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