So i finished my 4th board. Last one rides fine, not great but OK. Each board I have made I have struggled with air bubbles showing up in the glass after vacuum, mostly on the base, evident after I remove the board from the vac table. I am using a single sided vac setup, -25 vac. Here is my layup - from top down:
Vinyl
Breather
Peel ply
Glass x 2
Graphic on rice paper
Core (9mm cedar)
Graphic
Glass x 2
Release wax
Plexi
So my question is why am I getting these air bubbles? Everything looks good before vac but when I pull it all apart after 36hrs under vac I have various air bubbles in the glass ranging from pen tip size to 1". Am I not using enough resin? Is my vac not strong enough for a cedar core? Sounds stupid but, do I need a breather on the base? Is there a way to not have to sand so much and do flow coats after vac? Any help to limit my flow coats and sanding after vac would be appreciated!