And there's me thinking newer designs don't leak, the 500s leak around the perspex pretty well , used Captain Tolleys Creeping Crack Cure (the original)starts like water then thickens to a clear flexible seal, it stopped most on the first go,when initially applied excess can be removed for about 10 minutes with damp cloth.
Have always used Pledge to polish the perspex, it appears to be the polish of choice for a lot of pilots in US