We tried keeping resin and hardener mixture overnight without adding accelerator (Although it worked on some day's , results were inconsistent. some tubes have smooth ID and some didn't.

From what i read vacuum chamber does the job but , that solution becomes very expensive in my case as the volumes are very high.

since we have no exposure to the results obtained from the vacuum treated resin mixture. we are not yet confident enough to suggest the vacuum chamber as solution.

Please suggest some viable and economical ways if there are any.