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Moisture Cured Urethane

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Hi I'm new to this site and lure making. I have been air brushing some blank crank baits and went to seal them and used moisture cured urethane. The finish looked great except for a series of small fine bubbles running down the back. Does anyone have a solution to this problem our seen it happening their lures also.

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MCU tends to form bubbles if it is too thick anywhere on the lure, so I recommend just hanging the lure up after application so excess MCU drips off the tail of the lure.  It also behaves badly with many solvent based coatings, so if you used one underneath the MCU, it can cause bubbling or lifting of your paint.

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Mark, I like the MCU to penetrate the acrylic paint and bond to the undercoating (which in my case is usually epoxy).  It forms a very durable monolithic finish - as I found out when stripping lures that had been MCU topcoated.  Acrylic paint that is dried with a hair dryer is just that - dried but not actually cured as it would be if heated to above 300 F.  I think dried acrylic is porous and will naturally wick solvents and MCU down to the undercoat.  I don't know how many coats of Createx clear would be needed to stop that.  Dick Nite MCU when fresh will penetrate very quickly.  After it ages and begins to thicken, its penetrating power drops off.  I haven't seen the same penetration with other brands of MCU (Garco, Famowood) that have higher viscosity.

 

If you can stand the storage limitations (not sure I can!) DN/MCU is a snap to use - apply it quick (dip or brush) and simply hang the lure up to dry and begin to cure.  Doing anything else has always caused problems for me, especially rotating the lure after application which almost always causes areas of bubbling.

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MCU is amazingly tough stuff after it cures, I think maybe the toughest topcoat you can get that is also thin and "factory-like".  I do a single coat on bass baits and have never had any issues with its performance.  In fact, doing multiple coats of MCU can be chancy if you want to avoid bubbles.

 

I can't specifically comment on your particular brand of MCU, but all the brands I've tried are similar in durability.

Edited by BobP
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