So the recipe for succes was:
1: new rubber moulds, these where pressure casted at 4bar. You can see the difference in the pictures.
2: beter resin: this liquid stuf was far easier then the gunk I had. I squirted it in the mould using a syringe.
3: apply pressure and wait for two hours.
I also did an ambient casting as a comparison. That one actually was quite nice. However the mould has a few bubbles and had some residue from earlier experiments.








