is there a product or technique that I could use to remove decals that are 20 years old, yellowed and won't come off by scraping or with tape? Additionally, I'd like to not have to repaint the model if I can avoid it!
Any help appreciated!
You could try soaking a cotton rag or cotton ball in decal solvent and letting it sit on the decal for a while, might soften it some so you can scrape it off. Of course if you've clearcoated over the decal you may be out of luck unless you can remove it.
Might want to use a pin to poke holes in the decal so the solvent can soak under it.