Sealing card stock with laser engraved details

Hello all,

I have a question.
I just received a Dom Bugami kit of the IJN Nagato in 1:200 scale. Awesome artwork.
I purchased the additional detail items, the laser etched card stock parts. It is cut on the shiney poster board stock, .012" thick.

It is not printed. These parts will go on my resin parts I have. The more detail the better.
My question is what is a good sealer so I can paint over the paper card stock parts using acrylics. I want to use Tamiya paints.

The detail is so awesome that I am afraid that any heavy build up will fill in the laser etchings. You have to see the detail it is so fine.

I am trying to avoid any swelling of the card stock from the sealer. Lacquer based acrylic would seem to work but before I try anything I need some expert advice. These parts come from Poland so replacements take long to get to me if something goes wrong.

I spoke to Krylon and they said to use 1305. I have heard that Testors dull coat would work also.

Any help I GREATLY appreciated.

Thanks

Bob