@Ryan thanks for the input. It seems to make more sense during the wet sanding to not rub too hard, and in fact letting the slurry stand just a little longer was the idea that I came up with to get the pores filled more effectively. I also have though perhaps more curing time between applications may help. So I've left the stock aside for all of this week and won't touch it again until Monday. Fortunately I have busy weekend coming up so will be distracted! @dsmerrills thank you so much for the kind offer. The great news is that yesterday I did a tour of Lusakas gun shops and surprisingly I found a bottle of the light colour I have been using. This was the last thing I expected to find and these guys had one bottle sitting on the shelf, chuffed! So thanks again but I'm all stocked up now (see what I did there) and good to go with as many wet sandings as it takes to get these pores all filled.