Figured out why I got the buubles under the cloth.
I started out by pouring epoxy from the top middle and worked my way to the ends. It was working great at first but as I worked to the ends, the action of pulling the resin down at the ends pushed the cloth towards the middle and caused the cloth to bunch up and buckle creating bubbles.
so to summarise the mistakes I made so far...
Mistake 1 - Used clean epoxy to prime the foam, should have used epoxy mixed with microballoons or Q cell.
Mistake 2 - Allowed the cloth to bunch up in the middle when applying epoxy at the ends during layup. Should either have used vacuum bagging or should have worked the spackle knife sideways towards the ends instead of top down.
