Covering mdf joints

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Mongoose

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Hi guys

Im really struggling to get rid of the joint or seem that shows up after assembly of a cab. The same applies to the holes made for the screws. Even those are stand proud with body filler before sanding. It feels super smooth to the touch, but as soon as the spray paint goes onto it, it starts showing up. I start off with assembly, using srcews and glue, cut holes for whatever drivers, then fill all screw holes and external joints with body filler, sand, apply filler, sand, apply filler and sand until it feels good, then sanding sealer, sand and then flat, then apply 2 or 3 coats primer wit ha flat between coats and finally paint. No amount of sanding or body filler seems to be able t get rid of this. How do you guys do it? I would really appreciate any advise here please. This is gonna be my second build using the same drivers, and I really dont smaak doing it again.
:sd: :sd: :sd: :sd: :sd: :sd: :sd: :sd: :wallbreak:
 

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