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Water based finish on ranger board MDF

6/15/15       
Jim Miers

Been using ranger for a long time and always for machined panels like raised door panels with no issue. I decided to switch us over to ranger for some of our other products which we do water based latex/acrylic finishes and have had horrific results. I've never seen it before but I have only used solvent or oil based finishes with ranger board before. I am getting raised fibers all over the surface, even after 3-4 coats of paint and light sanding between. Every time I knock them down they come right back up, it's really kicking us in the rear!

Any tips with this? With regular grade cheap MDF this has never happened before, only that edges are obviously more difficult to paint on some parts. We shoot with a HVLP, partially thinned BM with a conditioner. Never had this happen with clawlock and the like on the solvent side. Thanks!

6/15/15       #2: Water based finish on ranger board ...
Jim Miers

I forgot to mention, if you look closely there are tiny specs of wood, pine in color throughout the sheets, which I think is what is raising, something you don't see in normal MDF, where it's a higher resolution / density of particles. Could it be defective product? I've never given much attention to it until now as I haven't had an issue.

6/15/15       #3: Water based finish on ranger board ...
nick

Odds are(99.9%) it's just the water in your primer and finish that's swelling the wood particles in the mdf. the sure cure is to use a solvent primer. Bin pigmented shellac is a favorite of mine for this application, but if you want to keep your system all WB there are some WB primer/surfacers that due a fair job at keeping wood swelling at bay (fair is neither good or great)...I've used Targets and it work OK.

6/16/15       #4: Water based finish on ranger board ...
arthur grudko

Every time you sand, you open a pathway to the substrate that allows water in, thus making more grain raise. Try spraying three light coats without sanding, letting it flash off dry to the touch, then sand and spray the topcoat.

6/16/15       #5: Water based finish on ranger board ...
Jim Miers

Thanks for the suggestions. It sounds like I need to get us back to regular weight MDF for waterbased finishes as it is not worth the hassle (actually worse). I ended up rebuilding some parts with some left overs just to get them out the door. Shooting three coats before scuff sanding wouldn't really make a difference, as I would have to sand it down again in the same way before the last coat, which would just reopen the wood fibers that are raising.

6/16/15       #6: Water based finish on ranger board ...
arthur grudko

Jim,

No, it likely wouldn't reopen the fibers if you waited until after you sprayed the third coat to do your first sanding. You would have buried any tendency to raise the fuzz.

6/17/15       #7: Water based finish on ranger board ...
Eric

I have the exactly the same issue with waterborne on Medex. I only use Medex so do not have experience with standard MDF. Because of this it has taken me a long time to realise it must be the Medex as nobody else posts about this issue. I have reluctantly added the step of sealing with Zinsser SealCoat which solves the problem.

6/17/15       #8: Water based finish on ranger board ...
Jim Miers

Here is what 1/4" ranger looks like and what it looks like after 2-3 coats with scuff sanding. The little fibers lift all over making for a terrible finish. Perhaps Ranger just isn't compatible with waterborne finishes, or at least primers to seal the face. I will test it with a solvent based primer to be sure. Problem is I've got a unit of this stuff in different thicknesses. Lesson learned, should have tried it before picking up such a load to stock up on!


View higher quality, full size image (3264 X 1836)


View higher quality, full size image (3264 X 1836)

6/17/15       #9: Water based finish on ranger board ...
Brian T

We spray roughly 20 gallons of chem craft water based primer over ranger board every week. I would look for a better primer. The grain raise is certainly a problem but for us it is gone with the first coat of primer.

6/17/15       #10: Water based finish on ranger board ...
Jim Miers

Brian,

Thanks, I am comforted by that and that's why I seek feedback from you guys because I can't be the first person to shoot ranger with a waterbased finish! I will check around and test different finishes. I really was anxious to get all of our products into ranger as it paints so much better than regular weight and as always new processes are a learning experience.

7/4/15       #11: Water based finish on ranger board ...
ramkumar Member

Website: http://www.onlinemarketingcourse.in/

. Bin pigmented shellac is a favorite of mine for this application, but if you want to keep your system all WB there are some WB primer/surfacers that due a fair job at keeping wood swelling at bay (fair is neither good or great)... - See more at link below:

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