You've already had your chance.In the Apostle Paul's defense of the resurrection, he stated:
1 Corinthians 15:29
29 Else what shall they do which are baptized for the dead, if the dead rise not at all? why are they then baptized for the dead?
The Apostle Paul certainly believed in the doctrine and used it as a defense of the resurrection.
No, Paul did not necessarily believe in the doctrine; there is nothing in any of his letters that stated belief, approval, or disapproval. Here is what we know: This custom differs greatly from the Mormon custom. The LDS Church baptizes people who lived their lives in another faith; during their lives had informed Mormons they did not wish to become Mormon; yet a year after their death, Mormons baptize them into the LDS Church anyway.
What has been learned that in Paul's day, if someone was undergoing instruction in the faith, but died before they were baptized, someone was baptized in their behalf. This practice did not last long, and it seems to have taken place in one community only, and even there it was quickly abandoned.
In general, I hold the LDS faith in esteem, but I despise their practice of baptizing the dead. It is truly despicable. First, it is a sin against those who would have no wish to go through an LDS ceremony. Second, it is my understanding the dead don't need to "accept" the baptism. This constitutes a blasphemy against their own ordinance. They toss it about, indifferent as to whether their conscripted soul treats it sacredly or despises it. Would an LDS member grab me off the street and force their baptism on me? No, they would not. I also asked a member of the LDS Church if I could be baptized without joining their church. No, I could not. Yet, they will wait until I'm dead and do it.
2nd chance salvation is not baptism for the dead.
It applys only to those that didn't have a chance.