The only way I’ve been able to prevent leakage is to use small brush strokes and small amounts of glue. If it’s your first time it’s going to happen. With practice you’ll get better. I use liquid because I’ve found gel type glues make a mess.
My first damaged statue was the Matrix Studios Shockwave. Not the statue you want come damaged. It came with a few broken parts one in particular that took me 4 times to fix. The break was so difficult and in such a bad place no matter what I did it wouldn’t sit properly.
Remember less is more. Also you’re going to laugh but I bought I practice SS statue on discount and broke it myself to use as a fixing dummy a few years ago. It also helps I’m an art major so I’m good with matching paint and using clay fillers. Go to Walmart buy a toy or an outdoor garden statue and have at it.