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Rough lacquer

1/20/15       
Tadhg

I recently switched from bin shellac primer to mb Campbell's lacquer primer and have noticed a problem we use mdf panels and the finish is very rough to touch. I tried sanding with 220 but same thing and they are not all same some spray smooth but most are very rough what am I doing wrong thanks lads

1/21/15       #2: Rough lacquer ...
Jim Clark  Member

Website: http://s51.photobucket.com/albums/f386/jcquack/Fur...

that sounds like it may be drying to fast.
Use a real slow thinner, in warm conditions
a little retarder helps.
I don't even use lacquer thinner anymore,
I switched to automotive urethane reducer,
the slowest one made.
I also thin lacquer at least 100% to get
a smooth finish, sometimes 150%

1/21/15       #3: Rough lacquer ...
Mitch Suber

Website: http://subercustomshutters.com

I agree with Jim, fast drying finish means you are coating it with a fine grit from some of the finish being dry as it hits your surface. Retarder and the correct thinner will make a difference, and finding the correct ratios.
Mdf can also present problems on the cut or routed edges, but should be alright on the flat areas, if you are using a good primer. You may have to repeatedly prime and sand the edges, before painting. Mdf has a roughness on the edges similar to grain raising. I find when we size the edges, with a 50:50 mix of wood glue and water, let dry, then sand, we can go ahead with our normal prime and paint procedure. We apply the sizing with a glue brush or similar small paint brush. Be careful about getting this mixture on the flat area, it can cause a slight swelling. We wipe the flat area dry as we apply the mixture to the edge.

1/21/15       #4: Rough lacquer ...
Tadhg

Thanks lads could ye tell me what type and make of retarder I should use And thanks for the responses. Ye have been great help thanks tadhg

1/21/15       #5: Rough lacquer ...
Mitch Suber

Website: http://subercustomshutters.com

Wow, I just reread your first post. If the primer is being a problem, I have never used retarder in primer. I always worked out primer issues with thinner and gun adjustments. I do remember finding that all lacquer thinners are not the same. Some are hotter than others and can cause different results with primers. Be sure you are using a thinner rated for your primer.
If paint is a problem, my long ago lacquer experience is limited to a brand I no longer remember, and currently I only use Sherwin Williams brand. They offer two different strengths of retarder, the one I use is referred to as a super-retarder. I probably only use about 1 1/2 to 2 oz when mixing 1 quart of paint, plus some thinner. If you are interested in the Sh Williams information, I can get it tomorrow when I go in, plus the mixing ratios. If you use another brand, be careful and experiment before using on your product. Too much retarder is a whole new problem, I have had shutter orders not dry for several days when using too much.


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