u/chaos_reigns_001

I have a couple of huge cracks (appx 10 inches on one side, 8 inches on the other side in a fiberglass bathtub, below the basin curve) in the bbottom of my bathtub, and I want to do a fiberglass repair on it. I was told to put expansion foam into it to stabilize the bottom before doing the repair. I have since been trying to research the good, bad, don'ts and dos of this, but it has a lot of mixed answers. I have gathered from the researching that I have done so far that an 8 pound, closed cell, polyurethane expansion foam injection would be best to do this with, but the thing I am concerned about is the amount of expansion. I don't think I would have to inject enough in the cracked area to worry about the tub unseating etc, but I am concerned about the foam coming up through the cracks. Would that be a big issue? Would it be difficult to clean up after it cures? Would there be significant rounding of the tub bottom if it does creep back out? Would it make it more difficult to do the fiberglass repair in general? Will it make it more difficult to replace the tub later? I can't afford a full tub replacement right now, so I would like to repair well enough to last a couple years, hopefully... I am currently dealing with big bills and loss of work hours. Any advice is appreciated. (So far I haven't found a bathtub repair professional in my ares, as I am kinda rural) Thank you!

Crossposting in /plumbing /plumbingrepair and /askaplumber

I have a couple of huge cracks (appx 10 inches on one side, 8 inches on the other side in a fiberglass bathtub, below the basin curve) in the bbottom of my bathtub, and I want to do a fiberglass repair on it. I was told to put expansion foam into it to stabilize the bottom before doing the repair. I have since been trying to research the good, bad, don'ts and dos of this, but it has a lot of mixed answers. I have gathered from the researching that I have done so far that an 8 pound, closed cell, polyurethane expansion foam injection would be best to do this with, but the thing I am concerned about is the amount of expansion. I don't think I would have to inject enough in the cracked area to worry about the tub unseating etc, but I am concerned about the foam coming up through the cracks. Would that be a big issue? Would it be difficult to clean up after it cures? Would there be significant rounding of the tub bottom if it does creep back out? Would it make it more difficult to do the fiberglass repair in general? Will it make it more difficult to replace the tub later? I can't afford a full tub replacement right now, so I would like to repair well enough to last a couple years, hopefully... I am currently dealing with big bills and loss of work hours. Any advice is appreciated. (So far I haven't found a bathtub repair professional in my ares, as I am kinda rural) Thank you!

Crossposting in /plumbing /plumbingrepair and /askaplumber