It's easy as. Just a 50-50 mix of silicone (must be 100% pure silicone, which is easy to find at Bunnings etc) and turps. I did mine on the outside and you can hardly notice it. Mix it in a cup sized container & paint it on. Needs a bit of time to dry, I just got some talcum powder & chucked it on it to make double sure it wasn't sticky for when I repacked it.
Also do a few strips on the inside on the floor so your inflatable mattress doesn't slide around.
Mine's a tarptent and they have a good vid on it here.
Tarptent Videos
It's down the bottom titled "How to seam seal"
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