It's not advisable to repair type AR conformal coating with type UR.
   
  The solvent from the type UR will usually dissolve the acrylic. 
   
  Mixtures of types AR and UR conformal coatings do not have MIL SPEC approval. They have never been tested. I have literally seen thousands of conformal coating candidiates fail those tests. It would be like using an unapproved coating. 
   
  It is likely that acrylic would interfere with the polyurethane curing. 
   
  The interface of the resultant coating would be of variable composition.
   
  To go one step further we did not recommend repairing 1B31 with type 1B73 and visa vera.
  The combination was never been tested. There are ways of distinguishing between the 2 coatings. 
   
  Ed Mines
   
   
   
   

 
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