On 05/05/2011 05:42 AM, Gerald Ross wrote:
After the roughed bowls were dry (no longer loosing weight) I finished
turning a couple and finished them with the usual shellac/wax finish
(Crystal Coat). In two days they were sticky.

I wiped them down with acetone and sanded down to the bare wood. Applied
two coats of polymerized tung oil (Lee Valley). They looked good for
nearly a week then the sap mixed with the tung oil and made a wrinkled
soft mess over the heartwood.

Scraped and sanded to the bare wood, applied two coats of Bull's eye
shellac, using 0000 steel wool after each coat was dry. Again used the
polymerized tung oil. Same result only it took longer to wrinkle up.

Scraped, sanded, acetone then 4 coats of shellac until a slightly glossy
finish, then two coats of tung oil. So far this has stayed hard and the
grain shows well. The only problem is getting a level coating each time,
requiring steel wool to even it up.

I would have never fooled with the stuff if it hadn't been for the
sentimental value of the tree and folks wanting bowls from it.

You should have cooked the bowl to crystallize the sap...

--
Kevin Miller
Juneau, Alaska
http://www.alaska.net/~atftb
"In the history of the world, no one has ever washed a rented car."
- Lawrence Summers