I asked Ilford about this and they definitely advise against dry mounting of any ink jet prints.The response from their tech support:
"ILFORD stopped using dry mounting tissue inhouse > 12 years ago and we do not suggest using hot mount and flat bed presses for any inkjet media types. Please ensure that you only use mounting products designed for Inkjet use. Spray mounts today or pressure sensitive adhesive films are the ones normally suggest for ink jet. Most good suppliers can supply those mounting adhesives designed for inkjet applications. If you do need to use hot mount products then please ensure you use the low temperature versions specifcially designed for inkjet."
AFAIK, photography is unique in having a tradition of permanently attaching a print to a mount. No one would dream of using such techniques for other forms of valuable art (prints/watercolors/etc.), and AFAIK it is not considered conservation mounting these days.
The material that you mount to also needs to be considered - standard foamcore, acid free or not, tends not to remain flat. I have 20X24 pieces that were mounted with spray adhesive to 1/8" foamcore that within a year warped and bowed badly. Maybe a heavier foamcore, or an alternative material is needed - I will never do that again! There is discussion of this on other boards, with the consensus being that foamcore is likely to warp, the thinner, the more likely.
Never easy, eh?
Jaan
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