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Author Message   Gez Tinkerer Username: Gez Post Number: 275 Registered: 09-2007 Rating: N/A Votes: 0 Posted on Wednesday, April 13, 2011 - 03:21 am:    Just for the record; 100% petroleum spirit/ naphtha/ white spirit/ ronsonol/ lighter fluid will NOT damage glass surfaces or optical coatings. If the 'naphtha' is paint grade it may be contaminated with acetone and chlorinated solvents and there is the remote possibility the misapplication of such solvents will result in melting the cement used to secure older doublets.