The mirror was completed by the end of 1981; it was washed using 2,400 gallons (9,100 L) of hot, deionized water and then received a reflective coating of aluminum 65 nm-thick and a protective coating of magnesium fluoride 25 nm-thick.Doubts continued to be expressed about Perkin-Elmer's competence on a project of this importance, as their budget and timescale for producing the rest of the OTA continued to inflate.. 
 a lè rí ìsọdipúpọ̀ gẹ́gẹ́bí àtúnṣe àfikún.àwọn ìtọ́kasí.. 