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I used to refinish wooden golf clubs and I sprayed them with deft polyurethane and they came out looking great. Just wondering if that would be good for finishing guitars.

Refinishing a guitar?......as in spraying poly over lacquer? I don't think this would be ideal.

You can finish with polyurethane and it's a stable finish that is durable. The downside is it isn't as repairable as a lacquer finish so if the finish gets damaged, you might have to sand/remove the finish from the entire surface (whole top/back etc.) and re-spray a new finish where you could spray new lacquer on top of old lacquer and it will burn in.

Can I drop fill a polyurethane finish using nitro? I tried and it didn't turn out well at all. Can I drop fill polyurethane at all??

nehsgolfer wrote:Can I drop fill a polyurethane finish using nitro? I tried and it didn't turn out well at all. Can I drop fill polyurethane at all??

Using nitro? not going to work very well as you have found. Typical drop fill for a poly finish is done with CA.