I was just thinking about all the topcoats I've tried in the several years I've been building lures. Actually I've only tried six different topcoats, but it took me a long time to find a good one. Anyhow I figured I'd post my experiences with topcoat.
#1. None
At first I didn't know that I needed to use topcoat. It didn't really matter, as the lures that I was building then didn't catch any fish and even if they had they would have broken if a fish grabbed them.
#2. Minwax Polyacrylic
The first topcoat that I tried, and I actually caught a few fish while I was using this. Unfortunately, polyacrylic isn't waterproof and so these lures didn't last very long.
#3. Seal Coat lure & jig finish
This topcoat was waterproof, but it wasn't very durable in my experience and I started looking for a new topcoat.
#4. Minwax Spar urethane
This one actually worked for a while. But eventually I gave it the axe, too. It didn't cure fast enough for my liking, it had a brown tint that became more pronounced over time, and finally it started curing in the jar.
#5. Minwax Clear Brushing Lacquer
My experiment with lacquer was a miserable flop. I learned several things: (#1) lacquer is very toxic (#2) lacquer doesn't react well with solvent-base paint (#3) I needed to look for a new topcoat.
Note: Lately I've been experimenting with lacquer again and I've achieved some acceptable results. Not enough, however, to make me switch to lacquer for topcoat.
#6. Flex Coat High Build rod finish
I got this by mistake; I ordered what I thought was Flex Coat Ultra V, but it turned out that the description on the website I ordered from was incorrect and so I got regular Flex Coat. I gave it a shot, but in about a month it yellowed and my quest was not ended.
#7. Flex Coat Ultra V
My current topcoat. I haven't found any problems with Ultra V since I started using it. It's more pricey than any of the other topcoats I tried, but the price is offset by the fact that it is simply the best topcoat I've used.