Scratched and badly patched acrylic tub - help!
So, the never-ending story of my idiot contractor continues. One of his crew put a small gouge in my tub, so he brought out someone to fix it. I warned him before he did this that if I wasn't happy with the fix, he would have to take out the tub and replace it at his own cost. Anyway, his guy came and patched the tub, spilling acrylic goo all over and ruining a good towel and rug in the process (the contractor is paying for replacements).
On the day it was done, I noticed that the patch was more obvious than the original scratch. The scratch was only about 1/2" long, but rather deep (so it collected dirt). Now it's perfectly smooth, but the scratch and an area surrounding it (about the size of a silver dollar) is a completely different color/sheen than the rest of the tub - it almost looks like a splotch of white paint. I see no reason why a 1/2" scratch should require such a large area to be covered with acrylic patch goo, but there you have it. He said it would blend after a few days of curing, but it's been over a week and it's still obvious.
So, what can I do? I already told the contractor that this is unacceptable, and he said he will "try to smooth it out," but I am afraid of what that may mean, considering his complete ineptitude - he'll probably do more harm than good. Can I sand over the whole thing to remove the non-matching patch? Or should I avoid sanding over the area where the scratch was? I've seen a couple of posts here about sanding scratches out of acrylic - can I do this myself? If so, what grit should I use? Advice appreciated as always - thanks guys!