1) I use Epoxy to glue the Screen frame to the dash bezel. Balsa wood also added to create larger bonding surface. Filling the gap with the Bumper repair only. Bondo brand Glaze and Putty to fill pin hole.
2) I pre-sand ALL bezel and Lilliput frame with 100 grid. After SEM stuff dry, sanded with 100 then 150, then 230. Then on to 2nd fill, then sand with 150, 230, 400. The last sanding is with 400 wet sand. Prime, then wetsand with 400 and 600 for couple times. Also I did fill those pin hole during the prime/wetsand stage.