I've been making my own sealant for years now. Comparing with my buddies it seems roughly as effective as Stan's at sealing and lasts far better through summer for a fraction of the price. The one thing I don't like about my recipe is that it uses regular car tire slime.
My recipe:
16 oz latex mold builder
2 oz ammonia without added soap
32 oz pink RV antifreeze propylene glycol based
32 oz car tire slime
Anyone have their own recipe that doesn't use tire slime? I was thin