Is there a type of glue that is safe to use on motherboards?

[TheKidd]

I have a watercooling setup with a lexan holddown. I would like to glue the screwheads to the back of the mobo so that I can remove the lexan holddown without having to remove the motherboard from the case. Of course, I don't want to damage the motherboard, so I would like to know what types of glue would be ok to use. Thanks.