We don’t recommend it. And we don’t recommend against it.
The choice of thread and the sewing construction prevents 99.9% of the water from entering the tent through the seams.
If you want 100% waterproofness, you can use a Silnet Seamsealer.
Please be aware that only the Silnet (for siliconized fabric) seamsealer is an option and not regular Seamgrip because of the double sided siliconized fabric we use.
Also please make clear that the condensation that will be on the inside of the outer tent will in any case be more than any potential water from the outside that might crawl through the seams.
The Silnet Seamsealer is a perfect product to make holes waterproof again. But we would leave the seams as is, especially if the tent is new.
Seamsealing is very time consuming and hard to do it nice. It will also add weight to the tent. If you really want to do it. We would recommend pitching the tent inside out, that makes it 100x easier.