Tried Hi Tek powder

Discussion in 'Casting' started by Beef15, Oct 14, 2018.

  1. Beef15

    Beef15 B or somesuch

    Joined:
    Dec 16, 2016
    Messages:
    2,206
    Likes Received:
    2,225
    Location:
    Forsyth
    Like the title says, I decided to try Hi Tek coating using the powder, mixed with Acetone.

    Process seems easy enough, though with the dry time, two coats required, and the cooling time that entails I'm not sure it offers anything over dry tumbling PC, should have more consistent results regardless of temperature/humidity I guess. If I get the process down I imagine having trays in various stages will allow for decent production.

    My first batch passed the smash test but failed the acetone test, which reading tells me is insufficient cure time, and baking longer should fix, well, it didn't. I decided to load them anyway. Way less lubricity than PC, sizing was a chore, I was actually concerned I might tear my press from the bench. We'll see if they perform later.

    [​IMG]
     
    Glade8r, NKD and Butter like this.
  2. JimB

    JimB Picking it up slowly. Benefactor Charter Life Member

    Joined:
    Dec 16, 2016
    Messages:
    5,658
    Likes Received:
    7,142
    Location:
    Waxhaw
    I sense much leading in your future.

    Have you confirmed that your over is heating to 290F or a little more? Maybe you aren’t getting them to the required cure temp in which case I don’t think more cook time will help.
     
  3. Butter

    Butter Who’s in charge around here? Staff Member Benefactor Charter Life Member

    Joined:
    Dec 16, 2016
    Messages:
    4,211
    Likes Received:
    6,109
    Location:
    Kannapolis
    I tried Hi Tek and failed miserably, went back to PC. I have a tub of red left if you want it @Beef15
     
    Starkherz199 likes this.
  4. Clicker

    Clicker Member

    Joined:
    Aug 4, 2017
    Messages:
    131
    Likes Received:
    150
    Location:
    South Carolina
    Well I guess I'm in the minority since I prefer Hi-Tek to powder coating. I don't think it's a performance thing but rather that I don't like how powder winds up in places on the bench it is not supposed to be.
    The effort required to size my cast bullets only increases when I've made a mistake, like not tightly closing the mold, and cast "fat" bullets.
     
  5. Beef15

    Beef15 B or somesuch

    Joined:
    Dec 16, 2016
    Messages:
    2,206
    Likes Received:
    2,225
    Location:
    Forsyth
    Right there between 385 and 400 per the instructions. I don't plan to judge the performance of the product based off these since something is obviously not right.
     
  6. Beef15

    Beef15 B or somesuch

    Joined:
    Dec 16, 2016
    Messages:
    2,206
    Likes Received:
    2,225
    Location:
    Forsyth
    I was suspicious of such a thing, but the largest measured .360" before sizing, and only going to .357"
     
  7. Beef15

    Beef15 B or somesuch

    Joined:
    Dec 16, 2016
    Messages:
    2,206
    Likes Received:
    2,225
    Location:
    Forsyth
    If I get it working right...
     
  8. JimB

    JimB Picking it up slowly. Benefactor Charter Life Member

    Joined:
    Dec 16, 2016
    Messages:
    5,658
    Likes Received:
    7,142
    Location:
    Waxhaw
    Sorry, didn’t mean to imply that you didn’t know the right number, but have you used a reliable thermometer to check your oven.

    If you don’t have a way to do this maybe set it at 425 and cook a dozen and see what happens with them.

    And what mold are those from?
     
  9. Beef15

    Beef15 B or somesuch

    Joined:
    Dec 16, 2016
    Messages:
    2,206
    Likes Received:
    2,225
    Location:
    Forsyth
    Used an oven thermometer this time, but noted it to be very slow responding. I would've used my temp probe for instant read but it's at work, will be bringing it home this evening.

    When I've checked appropriate objects with my non contact they've always heated to +/-5 of setting, but those were either a longer time or less mass.

    Something going on with the cook is my suspicion as well. I'm thinking the temp is dropping substantially when the oven cycles off and my time probably needs to be adjusted up.

    NOE HTC 358133RN I'm a big fan of it for 9mm.
     
    JimB likes this.
  10. Beef15

    Beef15 B or somesuch

    Joined:
    Dec 16, 2016
    Messages:
    2,206
    Likes Received:
    2,225
    Location:
    Forsyth
    @JimB nailed it, temperature for sure. Oven would reach temperature for the intial few on cycles then plummet 20 degrees or more on the off cycle and never quite get back up. Figuring out how to accommodate the swing without going too far will require some trial. A better oven or a PID controller may be in order.
     
  11. Starkherz199

    Starkherz199 Professional Contrarian Charter Member

    Joined:
    Dec 17, 2016
    Messages:
    1,122
    Likes Received:
    1,734
    Location:
    here
    I've never had luck with the powder. The liquid however works great.
     
    Beef15 likes this.