Poly on headstock but finish in nitro?

[clive shakedown]

Hi there.
I am currently refinishing a Westbury bass, 1980 ish.

all going well but I have a question, the headstock has MOP inlays, and is factory finished in poly over the whole headstock including the MOP, I want to lightly rub the scratches out of the headstock, and then spray a clear nitro on to it.
would this work or would I have a bad reaction?

Thanks.

 

[pfox14]

Not a good idea to mix finishes like that. Could cause new finish to peel.

 

[JIO]

You shouldn't have any problem doing this. The old finish is stable (poly or whatever it is) and the nitro will not affect it. Light coats, allow for curing, emery sand and buff.

 

[Hopkins]

You shouldn't have any problem doing this. The old finish is stable (poly or whatever it is) and the nitro will not affect it. Light coats, allow for curing, emery sand and buff.

Absolutely.

The nitro will not affect the poly at all

 

[clive shakedown]

Thanks for the advice, on the subject of surface prep, especially since there is MOP involved, should the poly be abraded before applying the clear nitro?
I ask because I guess the MOP should be as shiny as possible under the nitro?

or would that mean the nitro won't "stick"

Thanks to everyone for the help.

 

[Flump]

Thanks for the advice, on the subject of surface prep, especially since there is MOP involved, should the poly be abraded before applying the clear nitro?
I ask because I guess the MOP should be as shiny as possible under the nitro?

or would that mean the nitro won't "stick"

Thanks to everyone for the help.

Absolutely you should sand the poly under the nitro. The nitro will be adhering via a mechanical bond to the poly as opposed to melting into old lacquer and it really needs that scuffing to bond to it. Don't worry about the MOP being shiny as the nitro will fill in the the gaps you create by sanding.

You seem to be failry new at it though so I would suggest not sanding with anything less than 600-800 grit before you spray the nitro.