Answer:
What has a head and a tail but no body?
What has 4 fingers and a thumb, but is not living?
If someone calls you this, it might be time to consider hot wax
I start in little but I end in full, you'll find me in half and complete.
Used to keep prisoners silent and to make temporary repairs on cars.
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.