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Painting mdf

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Forum topic by txn posted 01-23-2015 09:20 PM 1119 views 0 times favorited 16 replies Add to Favorites Watch
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txn

135 posts in 921 days


01-23-2015 09:20 PM

What tips or tricks do yall have for painting mdf edges. Every time I’ve tried it soaks up most of the paint is there a primer or something I could apply first before final paint?


16 replies so far

View Tennessee's profile

Tennessee

2410 posts in 1976 days


#1 posted 01-23-2015 09:28 PM

Years ago, when I worked with plywood a lot, I used to say, “No matter what you do, its plywood!” This kind of also applies to MDF.
You are working with ground and chipped wood, pressed together with a bonder. Hard to hide. My first inclination would be to fill it with wood putty to make it smooth, and then sand it and paint the result. I don’t have much more since it is MDF, which is a lower bastard child of plywood. Good luck!

-- Paul, Tennessee, http://www.tsunamiguitars.com

View dhazelton's profile

dhazelton

2324 posts in 1758 days


#2 posted 01-23-2015 09:32 PM

Prime, sand, paint, sand, more paint. Or edge it with poplar or something.

View Fred Hargis's profile

Fred Hargis

3932 posts in 1955 days


#3 posted 01-23-2015 09:32 PM

If you put something on it first to seal it, and then smooth that out you’ll have better results. That “something else” can be any of a long list…I’ve used glue size (just diluted wood glue, about 4parts water, part glue) and like it, but you could use spackling compound, drywall mud, or possibly just a thick primer.

-- Our village hasn't lost it's idiot, he was elected to congress.

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MrUnix

4211 posts in 1660 days


#4 posted 01-23-2015 09:42 PM

Just apply more coats.. it will eventually seal up and stop soaking paint. You could also prime first, but it will soak it up just the same.

Cheers,
Brad

-- Brad in FL - To be old and wise, you must first be young and stupid

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firefighterontheside

13458 posts in 1318 days


#5 posted 01-23-2015 10:05 PM

The glue water mix works. I’ve also just painted thickly for one coat, sanded and recoated with good results.

-- Bill M. "People change, walnut doesn't" by Gene.

View CudaDude's profile

CudaDude

176 posts in 1770 days


#6 posted 01-23-2015 10:06 PM

I’ve used automotive filler primer in a rattle can with excellent results. Have to put some work into it though

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

-- Gary

View Earlextech's profile

Earlextech

1159 posts in 2152 days


#7 posted 01-23-2015 10:16 PM

+1 with Fred Hargis – I’ve tried everything, but glue size seems to be easiest and quickest. 50/50 wood glue and water. Also works on any routed parts of MDF.

-- Sam Hamory - The project is never finished until its "Finished"!

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pjones46

986 posts in 2104 days


#8 posted 01-24-2015 04:01 AM

+1 with Fred Hargis and Sam Hamory

-- Respectfully, Paul

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firefighterontheside

13458 posts in 1318 days


#9 posted 01-24-2015 04:04 AM

I’m making raised panels with MDF tomorrow. I will have to tell my customer who Is doing the painting about this.

-- Bill M. "People change, walnut doesn't" by Gene.

View redSLED's profile

redSLED

790 posts in 1354 days


#10 posted 01-25-2015 11:16 PM

Pad on 1 light coat of water-based poly and brush over once – usually dries in 30 min – then fast block-scuff sand with scrap 180/220 sandpaper. Then 2nd coat of same – let dry for 60 min – then final fast scuff sand with scrap 220 – then done! Edge is sealed. I prefer this to using paint primer for the end result. And yes, I know poly costs more than primer. Therefore use up your leftover/dirty/old poly first for this.

-- Perfection is the difference between too much and not enough.

View OldRocker's profile

OldRocker

46 posts in 934 days


#11 posted 01-26-2015 12:51 AM

Dry wall compound works.

-- ....And on the seventh day the Lord created the Les Paul...and it was good.

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firefighterontheside

13458 posts in 1318 days


#12 posted 01-26-2015 12:57 AM

Made MDF raised panels yesterday for a customer. They turned out great, but I’m glad I’m not the one painting it. I’ll pass on these ideas though.

-- Bill M. "People change, walnut doesn't" by Gene.

View AlaskaGuy's profile

AlaskaGuy

2406 posts in 1770 days


#13 posted 01-26-2015 08:33 AM

http://www.finewoodworking.com/how-to/article/tips-for-painting-mdf.aspx

Haven’t done it but I’d think the glue diluted with water could swell the fibers.

-- Alaskan's for Global warming!

View Garbanzolasvegas's profile

Garbanzolasvegas

356 posts in 688 days


#14 posted 01-26-2015 10:45 AM

For the edge I would run my finger down it with some Water Putty sand then again

-- If you don't Play, you can't win

View AlaskaGuy's profile

AlaskaGuy

2406 posts in 1770 days


#15 posted 01-26-2015 11:26 AM



For the edge I would run my finger down it with some Water Putty sand then again

- Garbanzolasvegas

Have fun sanding that stuff when it dries.

-- Alaskan's for Global warming!

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