-
Have a look at this page. They describe the use cases for each of the products. Fibrex is now called Tough Multi Filler, Murex is called Rock Solid Repair Filler. They are the 2 most popular in the trade in my experience. I have used the others for specific jobs but Tough Multi Filler is my go to exterior filler. Murex is useful for rebuilding edges of masonry, like the corners of cills. Skimcoat might suit what you have to do there though.
https://www.toupret.co.uk/professional-filler/category/exterior-surfaces
Thanks again! Do you have links to those recommended products? I’m only really planning an ok job, not a proper one, under no allusions of first timer ability, just want it to last 2 or more years.