Captain T, Up above here - dunknow what ElCheapo you used, but we do know it was epoxy. I dunknow what epoxy is cheap?? Some paint store type places have two-part epoxy filler in jars, some have a couple nougat bars you cut and mix. Smith&Co make a rot repair kit that has a white filler, none of it is cheap! But depending on the temperature some of these fillers can take a week to harden up.
I just happened to stop by Smith&Co, the plant, where they retail too.
They have a one gallon kit (1/2 and 1/2) for $125 (!) of their Fill-It, which they put in their rot repair kits. But the stuff was originally, and I think it still is, the only ready-made filler in the market, the microbaloons and cabosil and whatever are mixed in already into the two parts. One has some color in it so you know when it's blended. It has a 3 hr pot life at 70 degrees, 16 hrs at 28 degrees. Hey, you minisotans can work clear thru the winter!!! That is if you are filling.
That's the rub. I don't think this will tool any better tham 407. But IMCO it ends up about as hard as the topsides. IT DOES NOT SAG. Steve Smith has a product here, but I don't know if It has yet caught on. I bought a sample to try, $20! I've used the filler for years, just not in this application
I just don't know why certain products become fashionable, like westsystem, others take forever to catch on. I overheard this young athletic sailer, who I've never seen with as much as a scraper in his mit, trying to impress an attractive gal who Was scraping her bottom - he was saying that westsystem was the only good stuff and don't get the junk local stuff from TAP. You know, the stuff I've been working with succesfully for a couple years.
I'll mix up a wad of the Fill-It, try it in a low spot, and report back, Tony.
Not advertised as a fairing filler but will sand to a feather edge. They did make a 'glazing' filler once that had the consistency of coolwhip, I think it had too many lethal solvents in it. Remember it smelled Strong. Smith&Co have a Hazardous Non Waranty Can't Be Made Safe label on they products.