- Nov 10, 2019
Has anyone sprayed shellac via airbrush? Mixed information online. Seems like it would be good for small clock cases.
The grain should have been filled with a pastewood grain filler prior to using shellac. Shellac has a natural wax in it and can cause adhesion issues with finishing products. From where you are I would sand the shellac and put a coat of Zinsser Sealcoat on it. It's shellac but has been refined more to remove the wax. Then you will need either a clear or a pigmented grain filler. There is Aquacoat which is clear and Mohawk makes a mahogany grain filler. Most grain fillers come in a natural color which is nearly white. It would make little white lines all over the wood. Another option would be to purchase a grain filler at a real paint store such as Sherwin Williams. It comes in the natural color but they can tint it like they do paint. Once the filler is dry lightly sand the surface to remove any grain filler which may be on the surface. Another note: Once you start back with the shellac allow it to dry overnight before doing any sanding. The solvents in the shellac will make the grain filler swell up and if you sand it immediately when the grain filler shrinks the wood will look grainy again instead of having a level finish.Today we sanded the case, had brush buildup and given it is Mahogany, it has a lot of open grain that we want to fill in.
Some areas are back to the wood with the grain filled, looked odd.
Saved the surfaces to smooth.
Shot it again, this air brush has a good pattern, it has a small bowl so easy to use, gave it a couple coats and it came out real good.
It has some spots where it still needs a little work, steel wool should be all that it needs to prep for next coat, will let it gure until next weekend so it should be good to work.
It worked very well on the columns, air brush is a must for larger areas or odd shapes.
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Bubbles in a finish normally indicate the finish wasn't thinned enough.Have been working on the finish in small time slots.
We needed to get the brush marks and grain peaks leveled down.
The shellac seems to sometimes react to a dust spec or other unknown item resulting in a bubble.
The airbrush allows TINY amounts to be added to build up a thicker coat and once it hardens it is glass like, except for the bubble.
We have a shaving tool that was a lathe bit, 1.5 wide tool steel with a chisel edge that can carefully shave just the bubble.
Then with a pencil point we can carefully add shellac to the bubble for it to fill in the area.
First photo is after first pass, next is ready for touch up, then touched up followed by our tool.
a good sharp chisel would do same.
Reduces sanding time.
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That sounds more like water in your line to me.Bubbles in a finish normally indicate the finish wasn't thinned enough.
That's possible but the amount of orange peal he has also suggests the finish wasn't thinned enough.That sounds more like water in your line to me.