Question
I produce musical instruments and am very familiar with high build, high gloss finishes using polyester and acrylic urethane. However, a customer now wants a "satin oil" finish with darker shading around the edges.
I am thinking of a hand applied oil based polyurethane type finish. Is this even possible? I did a sample by spraying the shading first, which went well (I used an oil-based ILVA ebony stain), but when I went over it with the polyurethane oil on a rag, the stain smeared.
I'm at a loss on how to do this. Am I only left with spraying a hard satin urethane finish so the shading doesn't smear? I am concerned with the final finish being smooth enough if I spray a hard satin urethane. Gloss urethane gets lots of sanding before it's buffed, so I know it will be smooth. I won't be able to sand a satin finish if there are any nibs in the finish. I need ideas for the simplest, most efficient way to get a shaded satin finish.
Forum Responses
(Finishing Forum)
From contributor M:
You need to seal in the stain so it doesn't move. Add a little poly into your stain, which will act as the binder to seal in the shading stain. Then allow to dry. You then can apply your wipe-on poly without it affecting the reactive poly you added into the shading stain.
Find out the exact look desired and the level of durability required. An oil finish (e.g., linseed or tung oil) is an "in the wood" look that offers very little protection. A film forming finish (e.g., oil-base varnish/poly) can be applied in a satin sheen and with a few coats that are sanded smooth between each, will produce a much more durable finish.
If a film forming finish in a satin sheen is fine, then you can just use conversion varnish (CV) or 2-component polyurethane (2K PU). Who's going to know the difference?
Also, instead of using an oil-based pigment satin for the shading, you can use a dye and avoid the solvent compatibility problems.
If the customer actually wants a hand rubbed oil finish for some odd reason, start with a dye and then go with the oil.
Anyone else have a suggestion on a good sprayable black/ebony dye? (I also tried India ink, but because it is water-soluble, I was having trouble getting a dark enough shading without getting runs on vertical surfaces.)