Bottom plate is high peressure laminate over MDF, samples are tongue presser spatulas glued with epoxy.
Different paints and different drying times.
Six layers of release wax and half of the sample plate was covered with very thin layer of PVA.
Interesting notifications:
1: yellow strip, was just normal Pelikan Nakiplast, play dough (much beeswax?), soft and stcks to laminate, but releases fine and renders the shape pretty nice. Fastest.
2: Filler paste, the type that is used indoors to cover dents and holes on the walls before painting. Sandings easy on shapes, but shrinks - needs many layers. Porous and definately benefits from PVA.
3: Blue epoxy filler is expensive but nice. Dries few hours, but shrinks very little, sands just perfect and keeps the shape well. Only filler that is not porous and does not stick to mould.
other were different paints and drying times. I found one 1k epoxy base paint that dries fast, sands well and works out fine when let dry more than 24 hours. 12 hours you need PVA, shows on one sample.
Last sample was the traditional epoxy filler, primer, 2K urethane (dried 6 hours, which 2 hours in 90C in powder coating oven curing) and it worked out perfect ocourse. Looks horible, because I spread it with brush (5 ml of paint and 1 ml of hardener, hassle with sprayer). But the mould repeats the brush strokes beatiful.
Now I have the system (1k base paint, sanded fine, two days of drying (small samples faster when dried in oven) and wax + thin PVA) if I need waster, then beeswax and if I need better results, then 2K urethane, but that adds work and time.
Happy with test results, I actually got results.
Pekka