Seacast makes what they describe as a Syntactic blend of non-expanding foam capsules and a two part catalytic compound that when cured is durable and resilient. It’s ideally suited to replacing transoms by boring out the wood, leaving the fiberglass shell behind as a mold and pouring in their proprietary fiber-reinforced compound. The material, they say, cures with the strength required of a transom. I discussed it with the folks at Seacast and decided to drill injection holes in the transom panel and inject it in them until it squeezed out all the other holes. I taped up the transom as if protecting it from overspray and drilled through the tape. Then, I filled empty caulking tubes with Seacast material after mixing it with the hardener and premeasured fiberglass filler. After it began to harden, I peeled off the tape, removing all the excess resin and leaving only a handful of injection holes to grind and paint. The process worked like a charm and the resulting transom appears to withstand the flexing required by the thrust of the motor. I’m looking forward to watching a full transom poured and a boat re-launched with this slick product. Heck, I’m looking forward to launching mine. Or, my daughter is. I promised it to her and at 14—legal boating age in Florida — she’s pretty anxious to get the keys.