Part 2
In this video, we go through the process of recreating a hard to find rubber trim gasket for a 1958 BMW Isetta. We go through the process of setting up a silicone mold, casting a flexible urethane, and give many tips and tricks along the way. We will cast BJB's F130 High Performance Urethane Rubber to produce a part that looks as good as the original!
Shop our selection of cast urethane and silicones, or speak with our technical staff to help you pick the right one. We also have a huge selection of castable polyurethanes for making parts in the mold; from soft, flexible gels, tough rubber, on up to rigid plastics!

http://www.BJBenterprises.com
TC5041 Silicone: https://bjbmaterials.com/silicones/pl...
F130 Flexible Urethane: https://bjbmaterials.com/f130rv1ab/
6836 Black Pigment: https://bjbmaterials.com/pigments/ure...
UV100 UV Additive: https://bjbenterprises.com/index.php/...
E236 Release: https://bjbmaterials.com/releaseagents
Mixing Spatula: https://bjbmaterials.com/mixingspatula/

0:00 Introduction
0:44 3D Model
0:55 CNC Machined
1:00 BeadBlasted Surface
1:09 1Piece Open Pour Mold
1:14 DoubleSided Tape
1:27 Sharp Hobby Knife
1:38 Center the Pattern
1:58 Ensure an Even Gap
2:03 Hot Glue Mold Box
2:13 Calculate Volume
2:29 Clean & Dust Free
2:34 TC5041 Platinum 40A Silicone
2:58 Thoroughly Mix A&B
3:29 Bubbles Decrease Strength
3:33 Imperfections
3:39 Carefully Pour
3:52 No Mold Release
4:00 Level Mold
4:06 Remove Mold Box
4:11 Isopropyl Alcohol
4:19 Trim Flashing
4:25 Remove Meniscus (curved upper surface)
4:31 Sandpaper or Hobby Knife
4:37 Demold Silicone
4:55 E236 Urethane Release
5:00 Don't Flood Surface
5:05 Clean Level Surface
5:08 Straighten Mold
5:20 High Performance 30A
5:28 Choose the Right Material!
5:36 6836 Black Pigment
5:42 UV100
5:54 PreBlend
6:06 Clean Container Lids
6:18 DoubleMixMethod
6:25 Vacuum Degass
6:44 F130 Fast Working Time
6:49 More Material Speeds up Gel
6:56 Demold After 23 Hours