Tuesday, February 23, 2010

Can you paint over varnished would without sanding first?

I have a set of bookshelves which are currently wood woth a varnish. I want to paint them with a water-based gloss white wood paint. Do I have to sand them back first, or can I paint directly over the varnish?Can you paint over varnished would without sanding first?
No. The reason is this, the solvent used in varnish. Varnish and paints dry because the solvent evaporates out, leaving the hard paint material behind. Varnish is famous for providing a very smooth surface, which is why it is used, and also why any paint will not adhere properly (think tape on wax paper), unless it has a solvent which will work on varnish as the original did, which water based paints do not have. So the answer is to rough up the surface so the paint can adhere, hence sanding. Only light sanding is necessary, just enough to make a matte finish, so the surface is rough enough for the paint to adhere properly.Can you paint over varnished would without sanding first?
Sand first
No u must sand first .
You have to sand first!
you dont have to sandthem right back just remove the shiney surface less time consuming
sand first or it won't last but if you cant be bothered just slap a bit of paint stripper on then rub it off, much quicker
If you do not sand them you will find they chip very easily and the paint may peel
you have to sand it smoothly to all surface and apply varnish equally
You can if you want it to look pretty bad, it will peel if you dont sand the varnish down first. You dont need to go mad, just sand it until it loses the shine.
I agree with Paul J. Sand it only enough to rough up the surface then use a primer before applying your paint. Also I suggest an oil based paint. It dries harder and is a good finish considering there's a lot of place movement on bookshelves and a latex paint will scatch easily.
You don't have to sand it all the way back to the wood. Just enough to roughen the surface so you get some adhesion with the paint.
No !!! With nothing to adhere to it would chip very easy ! Spend the extra time sanding, remember ? if a job worth doing, its worth doing well !!!





Happy Sanding !
use a sanding block and sand lightly, then wash and dry thoroughly, you will get a much smoother effect.





Water based gloss isnt as tough as oil based or even eggshell paint, it can flake off or wear very quickly
Try painting over the ';would'; with ';Tippex';. Then overtype with the word ';wood';
It won't adhere properly. Take a little extra time and sand it first.
you must sand any smooth surface before painting,to help the new coat of paint stay on otherwise you will find you will have a hard time painting. normally a fine sanding is sufficient,but when I started my time as a painter and decorator I was told that paint may crack when applied on top of varnish.You pays your money and take a chance,better to take the varnish off.
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