I haven't seen mention of 303 Aerospace Protectant.
I used it first on my lifejacket. Looks new. That has been impressive.
I use it on my backpack, my shoes, and any fabric gear I want to keep looking good, avoiding destruction by UV.
I never thought to use it on my shelter. I take my shelter down in daytime, like you.
I gave up on tent floors long ago. First, I went to tent fly and footprint. Next, Outdoor Research Bug Bivy. Recently, to TiGoat Bug Net Bivy and Oware AsymTarp 1.
I use zipper lube or zipper lubricant on zippers. I also pull away about 45-degrees: zipper seem to like that. But check it out: zipper lube or zipper lubricant.
There are many brands available, because zippers often wear out first.
I have had the most expensive top name brand GoreTex. I rely on DWR instead.
What is so great about DWR is that Nikwax and McNett have DWR retreatment that works.
That said, my best most long-lasting perfect mountaineering jacket was British Ventile (pale green-grey with a more grey-green liner) purchased ages ago at REI. I got 15 years hard service when only the sewn-down-tight edges frayed, finally.
By the way, this experience was in the Pacific Northwest world of rain.
I have since seen this jacket with leather binding at the edges: pricey stuff.
I think if I purchased another British Ventile it would be an anorak with cord inside the hem and cuffs for a rounded edge, not a sharp edge.
I really love this subject: function and durability and reasonably lightweight.
Thank you, German Tourist for this thread.