Estes Time Warp Build, #7321, Part 11, Lower Fin Gluing

My plan was to spray the BT-5 cluster tubes - just the tight areas at the center.

Notice the centering rings and upper tubes between the rings has been masked off.

I ended up spraying more of the tube surface and the area where the main fins will be glued.

I sprayed the yellow fin tip (front and back) yellow before gluing the fins onto the model. On the left is the white undercoat, on the right is the yellow. 

Yellow paint was sprayed on the outside face and underneath into the fillet area.  

I tried to concentrated the yellow paint to just the inside areas between the tubes but the spray covered a wider area. 

The glue line (fin root edge contact area) was marked and the paint sanded off down to the tube.

Here's the gluing line sanded down to the white tube.

Keep the sanded area narrow so it will be covered by the width of the root edge.

The fins are a bit difficult to place, they want to fall off when gluing, like on the Gyroc and Orbital Transport. 

On the right, the fins are in place and filleted with white glue. 

Pre-painting will make masking the black easier and gives a consistent  yellow coverage. Those inside areas would be difficult to spray if all were glued together.