Hector, 
It might be off gassing 

Shane Chow
Stone Surface Specialists
Shane@loveyourstone.com
801-856-0164 cell

On Sep 21, 2014, at 4:29 PM, Hector Castillo <hectorcastillo@comcast.net> wrote:

I am testing durraamen e 32 water base primer on a Mexican a tile .I used a Short nap 1/4 roller it left small pin holes then I used u46 polyurethane on the 2 coat and you can still see the pin hole.
Any ideas way the 1 coat had pin hole . Hector castillo

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