Will Jesus's second coming be visible to all?

Yes.

Every eye wll seem him coming in the clouds in all his glory.

And then shall appear the sign of the Son of man in heaven: and then shall all the tribes of the earth mourn, and they shall see the Son of man coming in the clouds of heaven with power and great glory. Matthew 24:30
And then shall they see the Son of man coming in the clouds with great power and glory. Mark 13:26

And then shall they see the Son of man coming in a cloud with power and great glory. Luke 21:27

Behold, he cometh with clouds; and every eye shall see him. Revelation 1:7

No.

Nonbelievers will ever see him again.

Yet a little while, and the world seeth me no more; but ye see me: because I live, ye shall live also. John 14:19

Thanks to the WatchTower Society for pointing out this contradiction. (Reasoning From the Scriptures, p. 313, 342-3)

Will Jesus's second coming be visible to all?

Yes.

No.

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