You don’t need to seam seal all ultralight tents, just the ones made with silicone coated nylon, commonly called silnylon. Seam sealing is required to fill in the needle holes that are formed when the tent is sewn together. You don’t normally have to seam seal ultralight tents made with cuben fiber or silpoly (polyurethane coasted silnylon) because they can be seam-taped by the manufacturer. Silnylon tents can’t be seam taped because the fabric is too slippery and seam tape doesn’t stick to them.
See How to Seam Seal a Tent for in-depth instructions on how to do an expert seam sealing job.
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