Are there any consequences when after your wine has fermented and your have racked and stabilized if you add a can of 100% juice to your wine? I like my grape wine like Manishevitz.....I want to adjust the taste after the process has completed...thanx in advance!
The consequences are that you have introduced a whole new source of fermentable sugars, so you need to make sure that fermentation does not restart. Normally this is done using sorbate to prevent yeast replication (which effectively prevents further fermentation) after the wine is clear. You need to use the sorbate along with meta-bisulphite, to assure that it functions properly. If you do this, you should have no problems with renewed fermentation (e.g., exploding bottles).
Theoretically, you could achieve the same results by filtering the wine, using a very precisely-measured filter that would eliminate any remaining yeast cells. This is done commercially, but requires special equipment, and extremely sterile conditions, which are not normally available to the home winemaker.
As long as you take steps to prevent renewed fermentation, you can sweeten it as much as your taste buds can stand.
Happy fermenting --
Doug
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