Question on glass solar filters just slightly warm during observing

Hello:

 I have 2 full aperature glass solar filters.    1 for my C8 by Orion and 1 for my ETX90 (90mm Mak) by 1000 Oaks. 

 I've noticed after doing a solar observation, about 20-25 minutes the glass on the filters are just a bit warm and when I remove them there is ever so slightly a bit of warm near the correctors.

 My question is: does any one think that this "slight warm area"  could eventually damage the secondary mirror aluminum coatings and effect any glue that holds them in place?

Clear skies

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Michael Boschat  ( AAVSO colde =  BMF )
Halifax Center - Royal Astronomical Society of Canada