I have a small extension (ground level) at the back of my house.
It has a flat roof, and has a felt lining.
The felt lining doesn't look old or worn.
All seams however are visible (on the roof and in/around the built in guttering)
I've recently had a leak, coming in through my ceiling.
Due to budget etc, I was thinking to either
• Paint a sealant over all visible seams
• or, cover all visible seams with sealant TAPE
Which is the best thing to do please?