Hi everyone. I have a small low slope roof over my shed. Just shy of 100sq ft. Re. Gaf adhesive products, I was advised at a big box store to use storm watch as an underlayment and liberty cap sheet over that? I’ve been tooling around the internet and am now questioning if I should have just used felt and then the cap sheet? I already put down weatherwatch over half the roof space. The question arose in my mind because of the granular nature of the weathwatxh and my wondering if the cap sheet will stick to that in the long term. 2nd question, if the weathwrwatch can be used underneath, it appears the lap edge has a peelable strip coving the adhesive on top??? Or is it just a self sealing edge for nailing down? Thank you very much in advance.