Now if I can just find a reliable product to waterproof my aging canvas (not crazy about 303, doesn't seem to last very long and I'm not in a harsh sun or salt environment lately).
"I’ve used 303 till last year and went with StarBrite, ".
I had much the same results w 303 Fabric Guard. Finally connected w a tech rep that provided some very useful tips that made me a believer in 303 again...
Make sure you are using the 303 Fabric Guard meant for canvas & fabrics. There are different 303 products so be sure to check.
After cleaning & drying the canvas pick a HOT Sunny day and stretch the piece(s) out in full sun. Don't lay them on picnic table or other flat surface.
Warm the 303 by also leaving it in full sun (don't use it right out of basement or garage)
A light coat w fine spray applying w strokes in 1 direction will dry very quickly (don't brush or roll on or spray till saturated)
A second light coat 90* to first and let dry.
Done... reinstall.
The above can be done w biminis on the frame if you have safe access... just don't get over spray on walking surfaces as it is slippery.
Also don't get 303 fabric guard on plastic /vinyl windows it will make them brittle... use 303 protectant for vinyl & rubber
I had been doing my canvas in the garage on a spring day to avoid breezes out side... wrong on 2 counts... full sun and pick a HOT day.
After following above my results were significantly better and I had others in the marina asking what I was using.
Hope it helps!
I also fixed my problem... current boat has no canvas [emoji2]