Painting large panels, paint runs

[Bikeboy80]

Looking for some words of wisdom...

I am painting large recessed panels and am having some issues. Paint is Sherwin Williams Super Paint semi gloss.
I started by priming and finish coating with a sponge whizz roller and sanding with 220 between each coat. For the second finish coat I attempted to back brush the panel to get rid of the stippled look left by the roller. I couldn't get it brushed fast enough and left marks at the end of the stroke. So I tried to just brush it on today, again after sanding. Trying to get the paint on the wall I left too much and now there are runs all over. [mad] So I have to let it dry and will sand down again before recoating.

Does anyone have any helpful hints to be successful with it this time?

The two panels are are about 5'x3'

Thanks

 

[tjbnwi]

Floetrol.

http://www.spraygunworld.com/Information2/Latex/floetro.html

Tom

 

[JHC]

Don't brush into the corners. Always pull away from them.

 

[harmonpa]

You could consider spraying with airless as well it will apply faster or if your having problems with it drying to fast try floetrol which works well with semi gloss paints to reduce dry time and help with appearance problems that occur while applying.

 

[Pnw painter]

Another option is to use a paint pad on the large open areas and a brush wherever needed. This might help you work a little faster.

For a brushed finish to lay down flat it's important not to over work the product. Modern Waterborne paints set up very quickly. Brush the paint on and move on with as few brush strokes as possible.

Unless the areas surrounding the panels are using the same product you might want to consider switching to a different product that has better workability.

Sent from my iPhone using Tapatalk

 

[JustinWG]

A few other things to think about....

After you sand the surface down, are you doing anything else?  i.e. wiping it down with a dry cloth, tack cloth, vacuuming the surface, or possibly trying to clean it with a wet (chemical?) cloth, etc? 

I've seen people sand then jump straight to paint, which can cause a lot of different problems.  If you're wiping with a wet cloth, I'd highly recommend not doing that. 

Are these panels mounted/installed?  Or would it be possible to lay them down over some saw horses?  If you can, lay it flat, secure it, then paint.

Oddly enough, I recently had some issues brushing over pre-primed door jambs that were sanded to 220.  I was using SW Pro Industrial High Performance Waterborne.  My paint was fingering and not wanting to lay down.  I've never had this issue before, ever.  The local store and rep couldn't figure it out either.  They had me try their SW Pro Indust. DTM, which was just as bad.  Eventually, we agreed to try the new(er) Emerald Verathane.  Thankfully, that worked.  It was a really nice product to work with, but an entirely different beast. 

Bottom line, the only thing the paint store/rep could put together, is that by sanding it down to 220, it was possibly over sanded and by brushing the paint on a vertical surface it was causing the problem(s); suggesting the paint didn't have anything to bind to, and that the brushing was just pushing it around like a slop mop....  Which I'm still a bit skeptical on, as I've never had this issue before.

In the end, if you're still having issues after the next coat, talk to the vendor and see if they'll comp you a gallon of a "better" product.  Just explain your issue(s) and they should try to work with you.  It's in their interest to do so. 

Good luck.

**EDIT**  Also, can try to use a 1/4" or 3/16" tight knit mohair nap.  After the nap has been worked a bit, it will have different finish characteristics on an up-stoke v. down-stroke.  Pay attention to which looks more desirable and finish the work with strokes in all the same direction.

Sometimes, foam rollers can be a pain.  You end up pushing the paint around a lot and get really uneven application because of the product penetration (or lack there of) into the roller itself.  Personally, I have had issues with the edges of foam rollers leaving a tail when rolling panels, so I generally avoid foam all together.  Just my opinion though.

Super Paint is generally a really great product, but if you're wanting it to lay down and look glassy, then might want to talk to your store about something along the lines of Pro Classic.  It's designed to lay down better and hide some of the tooling.