LumberJocks

MDF Board

  • Advertise with us

« back to Woodworking Skill Share forum

Forum topic by MarkSr posted 11-05-2013 05:12 AM 1267 views 1 time favorited 25 replies Add to Favorites Watch
View MarkSr's profile

MarkSr

215 posts in 739 days


11-05-2013 05:12 AM

Topic tags/keywords: finishing

Hey guys, what do I have to do with this MDF to accept white spray paint. I put two coats on and it doesn’t even look like I did anything to it. I used a white primer in a spray can. I tried a small scrap piece and it took 2 coats of primer and three coats of semi-gloss white paint to complete it properly, with sanding between 2nd. and 3rd. coat of paint.
The major problem is the ends, like the end grain of plywood, but the top isn’t that much better. Any help would be appreciated. Thanks

-- Mark, ”...NEWBEE: On the road to learning a lot; but; a lot more to learn…” ("My Granddad used to tell me, if you didn't learn something new today, it just wasn't worth getting out of bed")


25 replies so far

View Joe Lyddon's profile

Joe Lyddon

7799 posts in 2741 days


#1 posted 11-05-2013 05:19 AM

Before you paint the ends, put some white glue on the edges… until it doesn’t suck it up… wipe smooth, let dry, then paint, etc.

Something like that…

-- Have Fun! Joe Lyddon - Alta Loma, CA USA - Home: http://www.WoodworkStuff.net ... My Small Gallery: http://www.ncwoodworker.net/pp/showgallery.php?ppuser=1389&cat=500"

View MarkSr's profile

MarkSr

215 posts in 739 days


#2 posted 11-05-2013 05:23 AM

Hey Joe, believe it or not I have a piece drying over night to see if that works, two great minds, huh??
I’ll let you know tomorrow if it works or not. If not, I’ll go out and buy what I am making, the paint will cost 3 times what the whole project is worth. LOL
Thanks for the reply

-- Mark, ”...NEWBEE: On the road to learning a lot; but; a lot more to learn…” ("My Granddad used to tell me, if you didn't learn something new today, it just wasn't worth getting out of bed")

View Rick M.'s profile

Rick M.

4140 posts in 1069 days


#3 posted 11-05-2013 07:12 AM

Spray with shellac then sand with fine sandpaper before painting.

-- |Statistics show that 100% of people bitten by a snake were close to it.|

View JPHW's profile

JPHW

4 posts in 537 days


#4 posted 11-05-2013 07:12 AM

Hi, what I have used on a few projects is thinned drywall mud. Wipe it with your finger onto any edge or routed profile. Let it dry then sand it off, prime, paint. It works quite well, very easy to sand and fills well. Justin

View MarkSr's profile

MarkSr

215 posts in 739 days


#5 posted 11-05-2013 07:18 AM

THANKS TO ALL

-- Mark, ”...NEWBEE: On the road to learning a lot; but; a lot more to learn…” ("My Granddad used to tell me, if you didn't learn something new today, it just wasn't worth getting out of bed")

View oldnovice's profile

oldnovice

3797 posts in 2057 days


#6 posted 11-05-2013 07:50 AM

On the edges I use spakling paste and sand after it dries, comes out smooth as silk.

I have also done this with plywood when I want to paint the edges, again it comes out smooth as glass.

-- "I never met a board I didn't like!"

View NiteWalker's profile

NiteWalker

2710 posts in 1266 days


#7 posted 11-05-2013 12:28 PM

What Rick said.
I’ve done the spackle/joint compound/glue size trick and while they all work, with shellac there’s very little waiting.

-- He who dies with the most tools... dies with the emptiest wallet.

View poopiekat's profile

poopiekat

3672 posts in 2423 days


#8 posted 11-05-2013 02:16 PM

This is a link to a website that frequently gets posted here in response to MDF finishing problems:

http://forums.shoryuken.com/discussion/67501/how-to-paint-mdf-to-a-mirror-finish-worklog

-- Einstein: "The intuitive mind is a sacred gift, and the rational mind is a faithful servant. We have created a society that honors the servant and has forgotten the gift." I'm Poopiekat!!

View Joe Lyddon's profile

Joe Lyddon

7799 posts in 2741 days


#9 posted 11-05-2013 07:18 PM

I think I was wrong… Instead of the glue, I think it was as these two guys suggested…

So, if the glue does NOT work, these suggestions WILL work! LOL :)

Let us know if the glue works… OK? LOL :)

JPHW Oldnovice

-- Have Fun! Joe Lyddon - Alta Loma, CA USA - Home: http://www.WoodworkStuff.net ... My Small Gallery: http://www.ncwoodworker.net/pp/showgallery.php?ppuser=1389&cat=500"

View tefinn's profile

tefinn

1215 posts in 1126 days


#10 posted 11-05-2013 07:55 PM

You need to prime with a shellac based sealer/primer, or as already suggested just use shellac. Any standard water based primer only preps the surface for the paint to bond better. With MDF you need to seal it. If you don’t have or want to use shellac, you can also use PVA drywall sealer.

-- Tom Finnigan - Measures? We don't need no stinking measures! - Hmm, maybe thats why my project pieces don't fit.

View TaybulSawz's profile

TaybulSawz

133 posts in 371 days


#11 posted 11-05-2013 08:01 PM

Yep, the thinned drywall mud will work for sure.

-- Still got all my Fingers!!!

View Bluepine38's profile

Bluepine38

2907 posts in 1774 days


#12 posted 11-05-2013 10:45 PM

I use the white Kilz primer on mdf that has to be painted white.

-- As ever, Gus-the 75 yr young apprentice carpenter

View 404 - Not Found's profile

404 - Not Found

2544 posts in 1658 days


#13 posted 11-05-2013 11:46 PM

Normal white emulsion paint for the edges (for walls and ceilings). Paint, sand, paint, sand – and the edges will be filled and smooth ready for primer. Zinsser BIN leaves a smooth opaque primer coat that won’t raise the fibres in the mdf, but clean up is messy (and expensive) and it seems to take longer for waterborne topcoats to dry.

View GOOD LUCK TO ALL's profile

GOOD LUCK TO ALL

418 posts in 416 days


#14 posted 11-06-2013 01:01 AM

Best I’ve EVER used is Pre-cat primer undercoater I get from Sherwin Williams.
Forget all the other time wasting options, couple of coats, sands baby smooth, powders up nicely, and is ready for paint.
I’ve tried the glue, drywall mud, spackle, by far the pre-cat has worked the best. Plus you can get it tinted for better top coat coverage, win, win
It’s not for everybody, but if your spraying it’s worth a try.

View MarkSr's profile

MarkSr

215 posts in 739 days


#15 posted 11-06-2013 06:16 AM

Hey Joe & the rest of you guys, as I stated last night I had a piece of MDF with white Elmers glue spread on with my fingers. I let it dry and this afternoon I sanded with 220 grid, by hand, (small sample piece), primed with primer in spray can, sanded lightly w/ 220, and two coats of semi-gloss white from spray can. Looks great. Tomorrow I will try one piece of the project.

Thanks to all.

-- Mark, ”...NEWBEE: On the road to learning a lot; but; a lot more to learn…” ("My Granddad used to tell me, if you didn't learn something new today, it just wasn't worth getting out of bed")

showing 1 through 15 of 25 replies

Have your say...

You must be signed in to reply.

DISCLAIMER: Any posts on LJ are posted by individuals acting in their own right and do not necessarily reflect the views of LJ. LJ will not be held liable for the actions of any user.

Latest Projects | Latest Blog Entries | Latest Forum Topics

HomeRefurbers.com

Latest Projects | Latest Blog Entries | Latest Forum Topics

GardenTenders.com :: gardening showcase