I created a turntable plinth which i venered with Pau Ferro (Bolivian Rosewood). I applied six coats of lacquer about 8 months ago. I have noticed a few very small cracks in the finish. I originally used a brush on semi-gloss lacquer. Can I add a few coats of spray lacquer now? Was thinking Deft Semi Gloss. What would the correct process be to avoid screwing this up, short of stripping everything (it is not that bad)?
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Pictures can be deceiving, but what I'm seeing appears to be cracks in the veneer along with a lot of cross grain sanding scratches. If that is the case better sanding practices with the grain only will eliminate the sanding scratches but the cracks in the veneer are another matter.
Agree with the sanding. What about my question regarding whether and how to add more lacquer?
More laquer will not fix the cracks, but yes you can add more . Just sand with fine sandpaper or a pad , mask and clean and spray the new coats.
What might have caused the cracks?
Either the veneer drying or the core expanding , could be something else but without knowing the construction one cannot know for sure.
Thank you
You might be able to minimize the cracks with a wood pore filler before applying more lacquer. Or maybe some CA glue and sawdust depending on how deep they are.
Can I ask what grit sandpaper you used it looks pretty coarse. Sanding between coats should be done with 400-600 getting finer as you approach the final coats. The final coat can be lightly sanded with 1500 then buffed and waxed to provide a nice luster.
If by spraying you mean spray cans remember spray cans have a high level of solvents and less solids so 2-3 coats equate to 1 sprayed through a professional gun, but don't try to compensate for this by putting on too heavy of a coat simply put 2-3 coats on before sanding followed by another 2-3 coats.
I believe i started at 600 and then went up to 1200.
Then those scratches are in the wood? 1200 grit should not have left scratches like that. Let it be a lesson to always sand only in the direction of the grain, cross grain sanding scratches are like neon signs.
agree.
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