[Palmetto Balsa]

I started out sealing with plastic utensils and Solo cups. Some of these plastics would dissolve good and some would not. The big difference between the Propionate and the other types of plastics is the durability. The plastic dips other than Propionate will look the same but once they harden they become very brittle. They are almost as brittle as a light bulb. Just a little bump will cause fractures in the sealer.
Propionate wood sealer is extremely durable. Sealed baits are slightly flexible (not brittle) but it will strengthen the wood. On the first dip the sealer will seep into the woods pours and bond to the wood. When it dries it will firm up the wood. Then subsequent dips (to build up the sealer) will bond to each prior layer of propionate. This will give additional strength to the bait and create a extremely smooth surface for painting. One of the best features, is its ability to make a strong seal with out adding a lot of weight to the exterior of the bait.
The pot life of dissolved propionate is indefinite. If 100% of the solvent evaporates from the jar, you will be left with a little blue puck of hard propionate in the bottom of the jar. It is still good and all you have to do is add more acetone or virgin lacquer thinner to get it to dissolve again.
Another great benefit of propionate is that it will work great as a topcoat over solvent based paints. I have never tested it over water based paints, but some have told me it will work over them as well.
Thanks for your question and please fell free to ask if you have any other questions. I will try to help in any way I can.
David