I use krylon products mostly, but there are other good sealers.
Krylon makes a full line of sealers, fixatives and clear-coats...but they aren't cheap.
Michaels Craft Stores carries the full line (only not all at once lol)
and they regularly distribute 40-50% off coupons in their weekly flyers, on their website and on the back of any receipt.
Any Art supply will carry the full line of Krylon products.
One of their products that I like is their Preserve-It Photo Fixative.
Its a sealer specifically for inkjet photos.
But I am suspicious that many specific products are the same thing,
with different labels/packaging.
I use both of their Low-Odor Clear and Matte Finish, as well as UV resistant Clear.
One has absolutely no smell for indoor use, the others stink like normal but dry in an instant.
Plus they have other Clearcoats, and thick Glazes.
https://www.krylon.com/products/pres...er-protectant/
https://www.krylon.com/products/low-odor-clear-finish/
https://www.krylon.com/products/matte-finish/
https://www.krylon.com/products/uvre...clear-coating/
https://www.krylon.com/products/trip...l-clear-glaze/
Problems with pre-sealing printed pages:
-sometimes leaves a powdery dull surface
-water-based glue won`t stick as well over heavier clearcoat surface
-makes pages curl badly (to combat this, try sealing both sides)
.........................
Home Hardware sells a nice clearcoat (I get it real cheap) that I have used on finished models.
It dries quick, and if you are careful about how quick and how much you spray,
you can put on a light sheen that won't damage the inkjet and protect the surface.
It also deepens and strengthens the colour whichI really like.
I tried it on my Centurion Tank, which was grayed out from age and crappy printing (originally)
and now its dark and green and vibrant.
Once a base coat is established, you can start spraying thicker coats
if you are trying to get a thicker gloss finish.
One of the problems with sealers and clearcoats applied before you build,
is they can affect how well the glue bonds.
The matte finish sprays don't seem to cause too much trouble,
but a proper gloss coat clearcoat will be a problem.