What's the best kind of wood filler to fill all of the redundant shelf holes, I'm steering towards Toupret wood filler as it's a trusted brand and I've used Toupret before albeit on a wall https://www.toolstation.com/toupret-wood-repair-filler/p10260 I'll be painting over them at the end, Zinsser have recommended their Bullseye 123 primer then I'll finish in a satinwood.