Can you paint or varnish over already varnished wooden floors? Do u need to sand them 1st?

I have lovely wooden oak floors which have been stained with a light coloured stain and lightly varnished however I'd like to change the colour to a deep brown and wondered if you have to sand down the floors or can you simply stain or paint straight over?Can you paint or varnish over already varnished wooden floors? Do u need to sand them 1st?
the best method is: mop the floor with very hot water and a neutral detergent ,this removes any grease,the apply the stain,one or two coats depending on depth of colour required.When dry apply a coat of floor seal diluted 50% with turps,if the floor really drinks this in apply another coat of same when dry,when dry apply a coat of undiluted seal, when this has dried,depending on appearance of the floor,another coat may be needed. Using the method I have given you are actually ';feeding'; the floor, this treatment should last for years.The best seals/varnishes to use are Ronseal or Bourne seal,pricey,but worth itCan you paint or varnish over already varnished wooden floors? Do u need to sand them 1st?
All floors need to be cleaned to remove dust and microscopic fat from the surface. Buy a coloured stain specifically designed for a floor and apply. This method will work just fine.
if i were you i would sand back alittle just to give it a better base for the new varnish to sit on
yes u av to sand it 1st take 2 mm off the top of the floor then u should b ready to paint and varnish
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You should sand them first. The stain will not penetrate varnish or paint.
sand first.
I would sand down first then stain, cause it would not take on if you did it on top of the varnish..
MILD STEEL WOOL AND CLEAN THOUROUGHLY WITH MURPHY'S SOAP


THEN APPLY A COLOR STAIN IN AN INCONSPICUOUS AREA AND SEE WHAT IT LOOKS LIKE
The stain is impregnated into the wood fibers.You will have to paint over it with oil base paint or sand off all the stain and varnish and start over with a darker stain. I'm lazy so I would lightly sand and apply a couple coats of polyurthene floor coating. I'd just be happy with the color.
you should sand down so the stain will soak in, then need to varnish again. sorry. lol
Personally anybody staining a solid oak floor should be shot. If the stain is oil based you will have to sand it right back as the oil soaks right into the grain. If not i would give it a light sanding then varnish it. You should never varnish on top of old varnish. A wooden floor is only as good as the preparation.