Self Isolation MoHo Maintenance

Top of my list is a newly discovered rooflight leak. I posted here the summer before last when I ended up desperately removing and resealing the main rooflight on our bus the evening before getting a ferry to France. I always knew it was a temporary job as I had to make do with this non setting mastic from woodies at short notice. I knew it was too runny at the time but it got us on the road on time for the ferry.
It must have been the battering we took from storm whatsitsface about a month ago in Ferrybank that moved everything about so much that the inevitable has happened and we have a little leak. I need to tackle it tomorrow which means more of the same non setting mastic from woodies or sikaflex ebt from b&q. I'm wary of the ebt in case it ever needs removing again but a bit of research tells me that once you keep a 3mm+ bond gap until its set, jobs a goodun for years.
I could order some dekaseal 8936 online, which I have used on another rooflight previously and its held tough and wait to do it later in the week or next weekend.

Any thoughts on flexible polyurethane seals like sikaflex / wurth bond and seal vs non setting bituminous mastic for sealing rooflights?

More importantly, what will you be sorting on your wagon between now and the reopening of the pubs?

Sikaflex every time. Get the mounting one if you can. Can’t think of the number now, but have some in the workshop. It’ll seal it perfectly, it’ll never move, but if you ever need to remove it, you can.

I guess if is a matter of who you ask. What seems like a lifetime ago when the the skylight mounts failed on my Tribby Davan recommended WURTH seal and stick and I have used it on several similar jobs always woŕked a treat.
On dont get that sold at Builders Merchants its different stuff