After using the glue, I make sure that the tip isn't clogged with glue before putting on the cap. If not, the glue in the tip will turn gummy and clog it. If I do find a clogged tip, I would have to remove the gummy material with a pin.
In 1995 I converted AMT’s 1964 Impala SS coupe into a standard Impala. I wanted to make a replica of my 1964 Impala hardtop coupe. I used the tips mentioned in this topic. I used a bench seat from the parts box. I replicated the door panels and side trim using sheet styrene. The Model Car Garage photo etch set was not available back then so the model kept the SS rear qtr. panel emblems. I also used the SS hubcaps since there are no standard 1964 Impala hubcaps in 1/25 scale. I plan on converting the Revell 1964 Impala SS into a standard Impala. Good luck on your project and be sure to post pics when you are done.