green03

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  1. green03

    Gelcoat - what am I doing wrong?

    I'm normally on the epoxy / paint plan as well, this one seemed like reasonable departure. I've managed earlier repairs at the same location with reasonable success. I thought about vertical (actually overhanging in part) surface. Seems to not have mattered for the leftovers in the cup I used for mixing, as it cured all the way up the walls. Covered up for now, will give it overnight and reassess in the morning.
  2. green03

    Gelcoat - what am I doing wrong?

    Air temp should have been fine by the late afternoon, though could have been warmer. However, the hull may have remained colder. Good to know about the 2o mils - I may be under in some spots. I take it the uncured gelcoat needs to come off completely before trying again?
  3. green03

    Gelcoat - what am I doing wrong?

    It may have to come to that - I have some, but not currently at hand where the boat is - but why would the mixed-in wax fail to work if on the hull, but not if in the pot? Good suggestion on the sprayer
  4. Applying gelcoat to some scratches, I run into the following: the gelcoat left in the pot (bottom and sides) cures nicely, gelcoat applied to the side of the hull does not, unless covered. The gelcoat is the type premixed with wax. Any suggestions?
  5. green03

    Scoring boats that modified mid series

    I like Brass's analysis for cases like the feathering prop; essentially permanent changes that just happened mid-season. For other changes, like the boat that wants to fly spinnakers from the middle of a weeknight series (perhaps they finally have a committed/experienced enough crew to do it), Borax's method would seem to discourage any gaming. In the fleet I know, adding a spinnaker puts you in a different class, so that's something neither method deals with.
  6. green03

    captains license question

    So, if friends agree before a trip to share expenses, is that voluntary or not?
  7. green03

    Epoxy question

    Follow up: leftover hardener (special combo) works well if actually mixed with resin. Couldn't resist and tried it with some leftover resin (same brand but slightly different epoxy system, but same mixing ratio and otherwise very similar properties/application areas). That cured fine as well. I even tried it in really small batches, which is always a bit more challenging. (For really small batches I like to use the little clear medicine cups with measurements in "dram". I've always had good results with that.) In the few weeks since the first post, the hardener was left in an open cup; there's been a bit of skin forming, just a hint, but I see no ill effect from it. Appears to dissolve on stirring. Time to use it up, I think.
  8. green03

    Downwind main trim in light to moderate

    Swept back spreaders interfere with barn door?
  9. green03

    A case against colored lines?

    Some other factors may make some lines more confusable. One one boat, trying to sail with same-colored spin sheets proved unworkable, while same-colored jib sheets were never an issue. Subtle differences in how these were run made all the difference. Ended up going to red-green but suspect any contrasting colors would have worked. Definitely not purely an issue of experience of preference.
  10. green03

    Epoxy question

    Same here - unless I forget to use resin
  11. green03

    Epoxy question

    Will do
  12. green03

    Epoxy question

    Thanks everyone for the pointers on mixing hardeners. I have half my "special" batch of mixed hardeners left over, and this means I won't need to throw it out, but only need to add resin.
  13. green03

    Epoxy question

    Good point. Is there anything in the chemistry that would make mixing different hardeners lead to a failed cure? Reason is that I have some left-overs that I'd rather use up than dispose of. (I occasionally use epoxy to mix fillers for applications where some degradation in strength, adhesion etc. wouldn't be an issue as long as the mixture cures, so the question isn't whether I get perfect results, only whether I can expect a goopy mess).
  14. green03

    Epoxy question

    Thanks. i do appreciate the (indirect) help. There was something so totally different from a garden variety imperfectly mixed batch, that I knew there had to be something really wrong; even though the process had "felt" completely like always. All your answers convinced me that I hadn't made a "normal" mistake, but needed to look for something unexpected. And that's when I looked one more time.... ... now I'm a bit embarrassed, but also ready to laugh at myself. And I'll be able to start over and get things to work this time - luckily the amount of wasted material is small.
  15. green03

    Epoxy question

    Thank you all for the replies - they made me check something which turned out not to be the problem, but in the process I stumbled upon the real "operator error". No, it was not insufficient mixing - no amount of mixing would help. No, it was not due to the ambient temperature - no amount of heating would help. No, it was not incorrect proportions - I did use a correct 2:1 ratio with 2 parts from the large bottle and 1 part from the small one. No, repeating the experiment would quite possibly not have left me any wiser. The embarrassing truth is that I purchased two bottles of hardener.. One of them was fast hardener and a bit lighter in color, so when mixing the two, it looked just as expected, as usually the resin tends to be clear and the hardener slightly amber. There are lovely conventions using big letters (A and B ) and I believe, also differently colored caps, but I use epoxy in moderate quantities, so I only ever have a pair of bottles going, and usually they come wrapped as a pair and after that, the big one is the resin and the small one the hardener...