Aires Quickboost has released an easy replacement for the AMK 1/48 Aero L-29 Delfin that enhances the canopy rail. There are no instructions but it is a simple replacement for the kit part. If you have the older Planet Models 12448 resin model kit of the Aero L-29 Delfin, this set will probably work on it as well, although I do not have that kit to test fit.
Quickboost has molded the canopy rail perfectly in light tan resin with no apparent bubbles. The Quickboost canopy rail is supplied on one resin sprue with a thin resin attachment to the part that will minimize any cleanup.
Although most paints will adhere to resin alone, I would recommend that you wash this part to remove any remaining mold release and prime it first. This part will need to be installed with your favorite CA (super glue) or epoxy, as the normal plastic glues or solvents will not react with the resin.