HD Tour pak hole repairs

[papalode]

Does anyone have knowledge of bondo actually working on hole repairs on an abs tour pak? After Internet researching and proceeding with abs/plastic and cement repairs, I found that they have failed in that the repair came to life and swelled or shrank enough so that the repair became visible. Repeated primer and sanding did not stop this from re-occurring. Good thing it was only primered. I would think that bondo would not do this. Ideas anyone?