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The cracks don't look too bad. That seems like a lot of wax. Keep a close eye on it. You might have to scrape some off so it can externally pip later on.I can't quite tell what I'm looking at, but it doesn't look to bad, IMO. @MGG will be a better judge of that.
Yes it works brilliantly.For future consideration, another option for sealing cracks is Liquid Bandage (suggested by @ChickenCanoe). Best of luck!