I have filled cracks many times without the issues of which you speak, plan ahead and seal all exits of material flow and don't overdo it with each coating. I place brown building paper on my bench to catch any drips, etc.
If you want to fix the issue he has and his wife has indicated that she wants it fixed then don't do it half way with putty, etc.
Jack
If you want to fix the issue he has and his wife has indicated that she wants it fixed then don't do it half way with putty, etc.
Jack