Michael.N. wrote: ↑
Fri Jul 28, 2017 11:22 am
Alan. If you scraped the larch did you then use the tru oil. . . or did you scrape, sand and then use the tru oil?
We need to know the purity of your methods.
Apologies, I missed answering this.
Yes I used tru oil. I've never used it before. Got it from David Dyke, along with instructions on how to use it. These, basically, said there were two "secrets"
Get the wood as smooth as possible before applying the tru oil.
Apply the oil in thin coats, wiping on then immediately wiping off, to prevent the oil penetrating the wood too much.
To achieve a very smooth finish Micro-Mesh was recommended, going through all the grades from 1500 up to 12000, after first sanding with garnet or lubrisil 240 and 320. I actually used a scraper first, on all wood surfaces including the larch. Then I used 240 lubrisil, then 320 lubrisil, followed by the micro mesh. This was a tedious process as there are 9 grades to get through. But I was amazed by the finish achieved. The wood, including the larch, ended up very smooth; silky smooth, with a noticable shine.
This dulled down somewhat after the first coat of tru oil. The instructions said to let this dry then rub down very lightly with 0000 wire wool, then do the same after subsequent coats. But 0000 wire wool had very little effect, so I lightly rubbed down with the final 3 grades of micro-mesh. This did the trick so I did it 24 hours after each subsequent coat.
In all I applied 5 coats of tru oil at one day intervals. I let the last coat harden for a week, then, lightly rubbed it down with micro-mesh 6000, 8000 and 12000. Then I burnished everything with Triopli powder mixed with 3 in 1 oil. I always used this to finish instruments dine with brushed on shellac, and it worked equally well with tru oil.
I would definitely use tru oil again. Applying it was very easy, though going through all those micro mesh grades was bit tedious. After four months the finish has proved itself to be practical and durable, though I have to confess that the small amount of time I spend actually playing the guitar is hardly likely to wear out the finish.