Yes if there are cracks I have used electrical tape - worked out good for me
I have 2 that were just really cracked up tuesday night & because today is lock down (& I didn't know if they were even alive till today) the earlier instance w/ using the tape, it was about a week into incubation & my dry hands & startled self dropped an egg on top of the others & cracked it.
Here's a photo of my current eggs - 2 eggs on the bottom left were the ones dropped by my little boy - the one on the right bled a little (you can see the circle of dried up blood on it)

I have 2 that were just really cracked up tuesday night & because today is lock down (& I didn't know if they were even alive till today) the earlier instance w/ using the tape, it was about a week into incubation & my dry hands & startled self dropped an egg on top of the others & cracked it.
Here's a photo of my current eggs - 2 eggs on the bottom left were the ones dropped by my little boy - the one on the right bled a little (you can see the circle of dried up blood on it)