There's a crack in my bathtub. Will this seal it?

I would not use plumber's putty as it is rather soft after curing -- you will be stepping on it at times and might displace it enough to leak. I had several cracks in my fiberglass bathtub and used a quality grade of clear epoxy -- where you mix the resin and hardener, as two separate components, together and then apply to the crack. To insure good adhesion of the epoxy, I first cleaned any residual body oils from the fiberglass surface near the crack with a solvent. Then I used a coarse sandpaper to clean and roughen the bathtub surface in the area of the crack where the glue would touch (maybe 3/8" wide along the crack path) -- so the glue would "get a good grip" on the otherwise smooth fiberglass. I had 3 separate cracks, each 2 or 3 inches long that I treated this way. I applied a bead of the clear epoxy directly over each crack -- a bead maybe 1/4" wide or so. I did not flatten the beads, but left them naturally rounded to give greater reinforcement to the crack. They will flatten a bit on their own as the epoxy cures. The result was good, with no leaks, though you can see the epoxy repair -- it is clear and the tub is light yellow fiberglass. I do not notice the epoxy when taking showers (I prefer showers to a sit-down bath) -- I don't feel the shallow beads of epoxy with my feet. At least, I don't notice them when I probably occasionally step on them. It's not a cosmetically-perfect repair, as you can see the repair, but it doesn't leak. I did this repair years ago and it is still holding. If you can find "bathtub repair paint" the same color as your bathtub, you could probably paint over the epoxy. I didn't try that, so don't know how well the fiberglass paint will stick to epoxy. Good luck. This repair may not look perfect, but it will save you a bunch of money over replacing a bathtub. I can't make any guarantees as (1) I'm not a plumber, (2) I am not there to look at your situation with the bathtub, so I can only give general hints on what worked for me. Your situation may be different from mine. Might be a good idea to ask a professional plumber what he thinks would work best -- without having to replace the bathtub.

Can this putty be applied to a wet surface? I want to fix a leaking toilet until I can afford a plumber.

I cannot think of any place on a toilet where this product would fix a leak.

My bathtub spout has been dripped and i removed it. plumbers putty has aged and cracked around pipe & spout. must i use new putty rather than silicon?

I'm not an expert, but I would probably go back with silicon. It will be harder to take apart, should you ever want to do so again, but I only use the putty around the drain ring.

Does this have a chemical or fuel oil smell, etc.? I am looking for a product without an odor.

There really isn't any smell. If you get it right at your nose, you can smell something, just like if you put pretty much anything right up against your nose. I have asthma and allergic rhinitis. It didn't bother me at all.

Product Dimensions	8.26 x 8 x 8 cm; 439.98 g
Item model number	01040
Number of Puzzle Pieces	2
Batteries Required?	No
Batteries Included?	No
Material Type(s)	Linseed Oil-based Putty
Color	White
ASIN	B008J3KPF0

AquaPlumb Plumbers Putty | White, 14oz, Fixture Setting Compound. Stays Soft. Use on Sinks, Tubs, Fountains and More., Compact (01040)

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