Gloss gel vice the matt gel.
The matt would probably work just fine, but not so good on clear parts.
FWIW, I use the acrylic matt medium (liquid not gel) as a light-duty adhesive and an additive for thinning acrylic, water-based paints.
I should also mention that there are entire series of TEXTURED acrylic gel mediums that work really well for added 3D weathering textures - mud and soil - to models.