How To Paint Over Wood With Polyurethane - Painting - DIY Chatroom Home Improvement Forum


Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Painting

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Display Modes
Old 02-20-2012, 11:31 PM   #1
Newbie
 
Join Date: Feb 2012
Posts: 1
Rewards Points: 10
Default

How To Paint Over Wood With Polyurethane


I have a stair rail that has a thick coat of polyurethane. I would like to paint it. Do I need to sand it off? Can I just use primer?

Advertisement

Ricki is offline   Reply With Quote
Old 02-20-2012, 11:43 PM   #2
Member
 
Join Date: Nov 2011
Location: Hartfield VA
Posts: 27,798
Rewards Points: 712
Default

How To Paint Over Wood With Polyurethane


Hand railing get a lot of abuse so paints not likly to stay stuck for long.
But if your still going to do it it would be best to sand it to get it all off, use bonding a primer then enamel paint.
No enamel paint does not have to be oil based. It's just a lot tougher paint.

Someone going to suggest a deglosser but I would be afraid to use it because it's powerful stuff and could drip on to the treads below, also with a hand rail your going to need the give the rail some tooth for the paint to have something to hang onto.

Advertisement

joecaption is offline   Reply With Quote
Old 02-21-2012, 06:08 AM   #3
Member
 
Join Date: Jan 2011
Location: Cape May, NJ
Posts: 2,392
Rewards Points: 1,000
Default

How To Paint Over Wood With Polyurethane


Ricki, welcome. You don't need to remove the poly. I would get some 150 grit sandpaper, and give it a good sanding. Wipe it down with a damp rag to remove the sanding dust. Then apply a bonding primer like Zinsser 123, which you can get a quart of at Home Depot. Then apply two coats of whatever trim enamel you are using on the rest of the trim in your house. It's best to use at least a semi-gloss, especially if it gets a lot of handling. Lower gloss might be more difficult to keep clean. If you prep right and use quality products, the handrail will stay looking nice and be sound for a long, long time. Good luck and stop back with any further questions.
Joe
jsheridan is offline   Reply With Quote
Old 02-21-2012, 06:16 AM   #4
Too Short? Cut it Again!
 
Join Date: Sep 2009
Posts: 9,634
Rewards Points: 2,000
Default

How To Paint Over Wood With Polyurethane


Why not use a white polyurethane or even a melamine product? I would not use regular latex enamel over poly on a railing. Only drawbacks to melamine are that it is brittle and chips; and it is somewhat challenging to apply.

You should have no trouble finding white poly at an industrial paint supplier. Or better yet, a marine supplier should have it in quarts. It is a little pricey. A bright white, high gloss, porch and floor product would work to for a railing also. Just have to think outside the box to find what you need.

For example this is a brand I used restoring sailboats ages ago.

http://www.iboats.com/Mega-Gloss-tra...view_id.363304

I do think you should scruff up the existing surface a bit to improve adhesion. I would not use a liquid de-glosser. Good old fine grit sandpaper should do the trick.

Last edited by user1007; 02-21-2012 at 06:47 AM. Reason: Added URL
user1007 is offline   Reply With Quote
Old 02-21-2012, 07:23 AM   #5
Rubbin walls since'79
 
Brushjockey's Avatar
 
Join Date: Mar 2011
Location: Mn
Posts: 2,518
Rewards Points: 2,000
Default

How To Paint Over Wood With Polyurethane


Painting over varnish happens all the time, but needs to be done right.
As sds is saying - its all about adhesion. Sand to dull the shine all over, this gives the primer something to grip to. Then wipe off dust and prime with a very good high adhesion primer. Here are some examples: Glidden Gripper, Insul-x Stix, Zinsser 123 and Smart Prime, Ben Moore Fresh Start, SW bonding primer, etc. This is the most important part- the first thing to hit the varnish.
Then finish with a high quality finish - after all that you don't want to use crap paint do you!
__________________
"It's better to come here with questions before you screw up than to come here after and ask how to fix them."- JS
Brushjockey is offline   Reply With Quote
Old 02-21-2012, 05:26 PM   #6
Member
 
Join Date: Jan 2011
Location: Cape May, NJ
Posts: 2,392
Rewards Points: 1,000
Default

How To Paint Over Wood With Polyurethane


I neglected to mention it might be a good idea to use some form of detergent/rinse prior to sanding. Handrails tend to collect a bit of oils/grease/dirt from hands. That hit me out of the blue today while driving. Wasn't thinking about it, just popped into my head.
jsheridan is offline   Reply With Quote
The Following User Says Thank You to jsheridan For This Useful Post:
user1007 (02-21-2012)
Old 02-21-2012, 05:38 PM   #7
paper hanger and painter
 
chrisn's Avatar
 
Join Date: Dec 2007
Location: Hagerstown MD
Posts: 6,866
Rewards Points: 2,240
Default

How To Paint Over Wood With Polyurethane


If it were mine. I would prep as stated and use a quality oil based semi gloss( if you can get it)
chrisn is offline   Reply With Quote
Old 02-21-2012, 08:05 PM   #8
Too Short? Cut it Again!
 
Join Date: Sep 2009
Posts: 9,634
Rewards Points: 2,000
Default

How To Paint Over Wood With Polyurethane


Quote:
Originally Posted by chrisn View Post
If it were mine. I would prep as stated and use a quality oil based semi gloss( if you can get it)
One reason I mentioned a marine finish. For some reason, some states seem not to have banned oil products for marine use. OP may be able to get an oil based poly at a marine store but not at the paint store across the street. Go figure!

Advertisement

user1007 is offline   Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Painting a room for new baby. Lots of questions. SuperAkuma Painting 15 01-01-2009 11:18 AM
flooring frankiedog Flooring 7 12-05-2008 02:05 PM
So many questions where to start?!?!(NEWBIE) painter84 Painting 5 09-15-2008 01:50 PM
prepping old wood for painting newb questions afabco Painting 19 08-07-2008 12:19 PM




Top of Page | View New Posts