Hi,

I am doing surface quality studies an want to seal a cnc milled cavity (surface roughness approx Ra 0.8µm) on a new/unused Sika M960 board (1,2g/cm3 density) with S120 sealer.
The laminates shall be of very high surface quality.

1) For this purpose: How many S120 applications do you reccomend? My plan is 4-5. Enough?
2) Referring to "De-Nibbing" a tool making professional explained to me, that he sands tooling boards after every sealer application with gradually decreasing grits from 400 to 1200: Do you reccomend this as well? How long do I have to wait until i can sand a S120 layer? 20min @RT enough? Or better 20min @60°C - The data sheet is a bit unclear here, unfortunately.

Many Thanks
Holger