I have some white grape wine I am about to bottle. Can you add tannin at this time or am I too late?

You could add the tannin now. If you do add tannin I would delay bottling right away. Bottle in a couple of weeks.

Thanks again...just wish I knew the right thing to do. Tastes ok in a sample glass, but the more I read about all these additives to do this and that...taste, preserve, makes's my head swim...or maybe I need a drink...any way, I thought tannin in a small amount might be appropriate. I thought I would do that, bottle in couple of weeks as you suggest, but save one gallon at bottom of carboy and add some other juice to blend and let it start again?? Any suggestions? Blending or additives just to give a contrast with initial white grape only? This is kind of fun. Thanks for all the help.

Years ago I did try re-fermenting. Never had to much luck with it.

Normally towards the last couple of weeks if my wine is too dry I will add some fruit juice to sweeten instead of sugar. Making sure I have added potassium sorbate and metabisulphate. Other than that I have tried some blending of different wines and that seems to turn out OK.

It is a hobby so experimenting is fun. We learn something everytime we try a new experiment.