Need some roofing assistance

The ridge cap ends cover the hip cap edges

 

(1.) The lifting appears to happen because the paint used to color the shingles acts as a solvent to the sticky-back material on the shingles. 

(2.) Also a heavy coat of paint that has a powder-ee surface, inhibits the self-adhesion. 

(3.) I used white glue to re-apply the shingles, let it dry for a couple of days and then over-sprayed the whole roof.   These brown shingle have too much paint, and required extra work.   Picture, after re-glued with white Elmer's glue, and then re-painted.  Note that the amount of paint is heavy.  

(4.) Some like the lifted, curled, look.  Older shingles/shows aging.

(5.) Another problem with the paper shingles that I noted.  One of my first BTS kits. Orbisonia Station. I applied the shingles, with out pre-painting the shingle sheets, then air brush painted the whole roof.  Noted problem was that when the acrylic paint dried, the paper shrunk significantly, to the point, I had to repaint the roof, to cover the white unpainted shingle showing.  Note how these shingle sheets curl/shrink as they dry.

(6.)Eventually with about the right amount of pre-paint on the shingles, this roof was acceptable. Also BTS shingles.  I used a pizza dough roller, increased pressure on the self-stick shingles.

 

(7.)Somewhere in the learning curve, I also switched, from model acrylic paints, to Rust-oleum Camouflage, flat, spray can, paints for large sheet part painting.  

I have no proven way of fixing the pulled-up shingles.  Since the roof is not usable unless fixed, you have nothing to lose by trying a drastic fix.  I'd think about it some more, right now i would try to solve the problem by using superglue - squirting it under each "loose" shingle and pushing it down to firmly glue them in place, then repaint while being careful not to do it again to other shingles

 

As to repaint, if that works, or not, I would strongly recommend a primer before the paint.  I use Rustoleum gray primer.  I cannot guarantee that it will not disolve glue and lift shingles, but it has been completely benign for me in the past in very similar uses. 

Stewart

It dont look so bad in the photo you are showing. Doubt anyone else visiting your layout will notice

Your roof looks like a real one with some age, i personally would leave it alone. You could use a little superglue on a toothpick to get them stuck down again. Keep up the nice work