Originally Posted by Brushjockey
Hey ric ( sorry- gonna hijack this bit..)-
i have a job next week that I am darkening existing handrails and knewls to match a new dark floor.
Oak with I believe conventional poly on them.
Couple of Q's -
You say clean with den. alcohol- I thought spirits did a better job of cutting waxes and polishes... comments?
My plan was also to clean after that with Krud Kutter ( oh- and scuff sand) - then tone WB Zar ultra Max with Transtints and build up the color- finishing with a clear of Ultra max.
Was hoping that a transition coat of Uni Shellac was not needed for adhesion... Comments?
Just for the OP- this could also be an approach to recolor your rail..
Have I ever mentioned how much I don't like polyurethane? Doesn't matter, I guess, but I don't. I think it's 6 of one, 1/2 dozen of another contrasting min spirits and den alcohol - I'm pretty certain alcohol works better on waxes, and spirits probably works better on oils - but I know you do a thorough job of prep and whatever the solvent won't remove completely, I'd think the Krud Kutter would...(If there's a concern about solvents, you could always use acetone - or clean lacquer thinner - which usually contains alcohol, acetone & toluene).
After a solvent wash, Krud Kutter wash and light sanding, I'd hope that the WB Zar would adhere to the existing poly without the use of a shellac coat...and speaking of shellac, see below;
WB Zar UltraMax is a Water-borne alkyd (modified poly) - so all rules regarding solvent poly applies. (1) Polys and Shellacs sometimes don't play well together, if you're considering a shellac tie-coat, use Zinsser's de-waxed version SealCoat
, (2) check UGL's TDS about the max number of poly coats in an app (usually 3), and (3) watch the re-coat times (re-coat after X hours, but before Y hours) especially since you'll be slightly altering the make up with transtints. How 'bout posting some before and after pics, this topic has come up before and it'd be kinda neat to reference a success story.
and you're right, if the lacquer toner aerosol doesn't work for Underscore, your system might be the best way for him to go...