You might want to reconsider the white choice. The only UV stable white option if you really want white is a different product which can be applied by cartridge, but the cost is about double this product.
Better option is to go with a light grey unless you do not mind the white yellowing somewhat.
While polyurea in general is more UV stable than many other products, white is simply a very unfriendly color.
Another option is to apply the light grey and then coat with a layer of white polyurethane. That would give you the durability and build of the polyurea and the UV stability of the polyurethane (which is more UV stable, but can’t be applied as thick).
Just remember… if you haven’t used these cartridges before, they require somewhat expensive spray equipment to apply.
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Spray Lining and Coatings Sales Support