My word Simon , those tracks look the part. Nothing beats the Pewter !
As you say the mud will cover any impefections, not that any appeared in your photos, they all looked fine.
I stopped buying Kursk mud from AK, and went on to cheap acrylics. Mixed with basic Wiko wall filler and some pva. Not had any problem yet, buy always build it up in thin layers, but do think the pva is a must.
John.
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