Alfa Romeo Giulietta SZ: Resin issues

I've had ongoing issues with resin and paint in the past. The Abarth just finished, which was an MFH kit, had some issues with the entire paint layer peeling off, fortunately in a spot where it didn't show; the cleanup and paint sequence was:

1. Soak 20 minutes in isopropanol (99%), scrubbing intermittently with a toothbrush;
   
2. Thorough rinse in warm water
3. Wash in Dawn and warm water
4. Air dry and carefully pick up droplets of water using Bounty paper towels
5. Two coats of Duplicolor Primer Sealer
6. Two coats of Tamiya Fine White Primer
7. Three or four coats of the final colour coat (Tamiya rattle can)
   

Where it peels, it all comes right up in a single layer including the Duplicolor Primer Sealer. I have had this problem in the past, with resin bodies from various providers, so I am assuming it is an incompatibility between the primer and the resin. So this time went straight to the Tamiya primer to see if there is an improvement.

I have also seen recommendations to use an acetone wipe but you have to watch this, because acetone will eventually dissolve resin, and you can't let it soak. So the question is if the exposure is long enough to do some good, is it also short enough to prevent softening up the resin.

Separately the first coats of primer on the Alfa revealed a crack running lengthwise in the roof, so to keep it from opening it up, I have glued a strip of styrene into the inside of the roof using Bob Smith IC-2000 Extra Strength CA Glue (20-45 second drying time).

The outside got some Tamiya filler, before sanding and more primer. After this, I had a reaction between primer and something on one of the fenders; so I sanded it off then cleaned it up with alcohol on a swab. New primer just on the affected area now sticks.

I am hoping I didn't create the crack when cutting open the door, which was done carefully. (The story of hinging the door will be told in a separate post).

Anyway all's well that ends well. The body is looking good, with primer, Tamiya TS26 Pure White, decals and clear. (and yes the engine compartment is also done). Next I'll tell the story of the hinge, but first I need to source some 5-minute epoxy.

Stay tuned!