How To Handle Large Undercuts In The Brush‑On Mold Making Process
Step 5: Applying a Thicker Layer
Measure and mix the third layer, adding pigment again to ensure even coverage. Apply this layer thicker with more fluid strokes. Allow the rubber to become 'tacky' and then thicken it with 'Cab-O-Sil' (no pigment added). Continue to thicken the seam and build evenly from top to bottom. Complete filling in the deep undercuts and all other undercut areas.
Measure amd mix the fourth layer, adding no pigment. Also apply this layer thicker using more fluid strokes. Allow the material to cure overnight. Visualize the support shell and 'map out' shell segments. Shell segments can be 2, 3, or more pieces to illustrate separation lines with my partner.
