Sprinkle flour on the worktop. Tip the mixture on to the worktop and knead for 10 minutes until springy. Turn the dough in a light layer of oil, place in a bowl and cover with clingfilm. Leave for 1 hour.
To assemble, grease a bundt or savarin tin with Trex. Melt the remaining Trex in a pan. In a bowl, mix the sugar, salt and spices. Take 2 tbsp of melted Trex, 3 tbsp of the spiced sugar and 3 tbsp of pecans and cover the bottom of the tin.
To make the glaze, whisk the icing sugar, vanilla extract, milk, cinnamon and melted Trex. Turn the monkey bread on to a serving plate and drizzle with the glaze.