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I have struggled with the same problem for a long time. Fast cure does not allow degassing so what do you do. If you are using urethane resins like RC3, store in the driest place you can. Moisture is a killer and will cause a lot of bubbles. I have seen that firsthand. Older resins that have been open for awhile produce way more bubbles than resin just opened/unsealed. Next solution sounds like BS but has helped me big time. Put baby powder in the mold first, close it and shake. Open the mold and let the powder out. I usually slap the two sides together to get it out. This should leave a really light coat of powder in the mold. Now pour you resin. You may still see the bubbles but most will be just under the surface and not popped on the surface. My baits are not perfect, but this reduced surface popped bubbles by about 90%.