What's your question? Ask

According to the Arbor Day Foundation, the white pine is the fastest growing pine tree, growing approximately 1 to 3 feet each year before reaching maturity (80 ft.).

It can drop sap anytime of year, but typically it is worst in spring and fall.

If this happened after it was repotted, it could simply be focusing on growing roots. As long as the plant looks healthy overall, I would not worry about it. It should start to grow again in a few weeks, particularly as the weather warms up.

You can put a splint on it like you would a broken bone and sometimes the bark will heal back. But the splint will always need to remain.

Here is an article that you may find helpful: https://www.gardeningknowhow.com/ornamental/trees/tgen/what-does-a-dying-tree-look-like-signs-that-a-tree-is-dying.htm

Yes, this is normal. While Sugar Maples are the most famous tree for running sap this time of year, almost all trees have increased sap production at this time of year. If the trees are trimmed ot otherwise cut, the sap will ooze some out of the wounds. It does not harm the tree though to lose this sap.