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My lacquer keeps cracking!

Discussion in 'DIY Strat Forum' started by Brad Funk, Mar 14, 2018.

  1. Brad Funk

    Brad Funk Strat-Talker

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    Im building a custom guitar from scratch and my lacquer keeps cracking. I stained the maple sealed and sprayed light coats twice a day til i had a decent thickness. Let it sit a few weeks and found major cracking in the surface. After several beers i decided to sand down to bare wood and start over. Restained and let sit a month or so. Sealed w sanding sealer, and started spraying one light coat per day, im on day 3 and see cracking again. I guess this will be a vintage cracked finish as i am not sanding down again, just for next time what is happening? The first time was mixed and sprayed through a gun, this time i went with rattle cans as ive had good results in the past. Thanks
     
  2. LordOfPudding

    LordOfPudding Strat-Talker

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    Is the guitar project being stored where there are wide temperature fluctuations? That could be a potential cause.
     
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  3. johnnymg

    johnnymg Most Honored Senior Member Strat-Talk Supporter

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    The basic problem is your "decent thickness" (for lacquer) is WAY too thick.
     
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  4. Groovey

    Groovey Most Honored Senior Member Strat-Talk Supporter

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    Perhaps what Jonnymg says above.

    I know my last finishing jobs, the parameters were temp above 65 f and humidity below 65%. And that's for the duration of the set period.
     
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  5. fezz parka

    fezz parka Making a record.... Strat-Talk Supporter

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    You want to go thick quickly, use polyurethane. One coat sits on top of the other.
    Lacquer blends with underlying coats. In a way, this can destabilize the underlying coats when you try to do multiple (more than three or four) coats too fast. Let it cure a bit. Like for a week for two at least.
     
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  6. Percy

    Percy Most Honored Senior Member Strat-Talk Supporter

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    I once sprayed a whole interior of a house with 'Crack Lacquer'....Why you ask because the home owner wanted it...
    Imo it looked like crap but she liked it....:thumb:
     
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  7. Brad Funk

    Brad Funk Strat-Talker

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    Im spraying outside around 50 degrees then bringing in the house, my last two guitars i sprayed in winter time then brought in. So i figured i was good.
     
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  8. johnnymg

    johnnymg Most Honored Senior Member Strat-Talk Supporter

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    That's one of the techniques used to generate lacquer check lines. :thumb:

    Well, maybe not the exact technique but rapid temp change is one trick to 'age' lacquer.
     
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  9. fezz parka

    fezz parka Making a record.... Strat-Talk Supporter

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    Lacquer cracking.
    Cracker lacking.

    Everything's better when it sits on a Ritz.

    :)
     
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