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Thread: hardener temp. questions

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  1. #1
    Join Date
    Sep 2021
    Posts
    13

    Default hardener temp. questions

    hi, I m panting my truck outside in my carport in the elements. I have put the shop line color coat on with a medium shop line reducer and the results are good except for a few fruit flies that landed on the fender. I will lightly buff with 600g wet paper then clear coat. I am using PPG shop line JC830 2.1 VOC production clear with PPG medium shop line hardener.

    I have concerns with the temperature when I will clear coat and I don't see it getting any warmer. Like I said I have the medium hardener 75-90 F or 24-32 C. I am dealing in Celsius and the temp seems to be pretty consistent in the afternoon at about 17 deg C.

    (1) Should I go buy the low temp PPG hardener 65-75 F or 18-24 C. since temp seems to be about 17 deg C which is pretty close to 18 deg C?
    (2) If i use the medium hardener and it is too cold what will happen?


    thank you in advance this is my first time painting and I have watched way too much on youtube I think.

    Jim

  2. #2
    Join Date
    Nov 2005
    Posts
    45,561

    Default

    Quote Originally Posted by Jimi View Post
    hi, I m panting my truck outside in my carport in the elements. I have put the shop line color coat on with a medium shop line reducer and the results are good except for a few fruit flies that landed on the fender. I will lightly buff with 600g wet paper then clear coat. I am using PPG shop line JC830 2.1 VOC production clear with PPG medium shop line hardener.

    I have concerns with the temperature when I will clear coat and I don't see it getting any warmer. Like I said I have the medium hardener 75-90 F or 24-32 C. I am dealing in Celsius and the temp seems to be pretty consistent in the afternoon at about 17 deg C.

    (1) Should I go buy the low temp PPG hardener 65-75 F or 18-24 C. since temp seems to be about 17 deg C which is pretty close to 18 deg C?
    (2) If i use the medium hardener and it is too cold what will happen?


    thank you in advance this is my first time painting and I have watched way too much on youtube I think.

    Jim
    Hi Jim, you should be OK with those products because the temp is close. Just be sure to allow enough time between coats so that you don't generate a lot of runs.

  3. #3
    Join Date
    Sep 2021
    Posts
    13

    Default

    Thank you I will buy the low temp hardener.

    I previously sprayed some clear coat with medium hardener on the doors when the temperature was fine for the hardener but I got what I believe is orange peel.
    I have drained my compressor as it had some water in it and I have a moisture filter near the gun on the hose.

    Any recommendations as to how to have a better texture with the hardner clear coat results?
    Attached Images Attached Images

  4. #4
    Join Date
    Dec 2015
    Posts
    1,136

    Default

    Pic has the appearance of being applied too heavy. I would either pick up my hand speed or back off on the distance to panel a bit. How are you setting up your gun? You can use either the slow or medium reducer. If you use the medium reducer just extend your flash time prior to next coat and check your tape lines for adhesion prior to applying next coat.

  5. #5
    Join Date
    Sep 2021
    Posts
    13

    Default

    Paint gun set to about 37psi spraying about 8 inches away and have paint flow sent to lowest setting of 4. Also using a moisture filter.

    The pic shows the texture I got after clear coat on the door. The colour went on nice and was pretty smooth. I did 1:1 paint with reducer. The clear coat that appears bumpy was 4:1 clear to hardener. I didnít use reducer with the clear coat but PPG sheets say I can use .5 of a part. I only used reducer when spraying the colour blue on.

  6. #6
    Join Date
    Nov 2013
    Location
    olympia,wa
    Posts
    1,759

    Default

    Quote Originally Posted by Jimi View Post
    Paint gun set to about 37psi spraying about 8 inches away and have paint flow sent to lowest setting of 4. Also using a moisture filter.

    The pic shows the texture I got after clear coat on the door. The colour went on nice and was pretty smooth. I did 1:1 paint with reducer. The clear coat that appears bumpy was 4:1 clear to hardener. I didnít use reducer with the clear coat but PPG sheets say I can use .5 of a part. I only used reducer when spraying the colour blue on.
    couple of things, most painters set their guns pretty much wide open on fan and paint flow. then adjust your speed and distance to get the finish you want. you might want to go ahead and add reducer to the clear as well so it atomizes well. usually around 10% or so. using slow reducer will let the paint flow a bit longer, but might allow it to sag if you're not used to it.
    set up the gun like this, open the fan all the way, then turn it in till it just clips the top and bottom. turn the fluid all the way out (full flow) then with the trigger pulled, turn it in till you feel the trigger start to move. the adjust the air for best atomization. 37 psi is probably a bit high, but all guns are different. set the air with the trigger pulled. i'm usually around 31-32 psi with mine. but sometimes i bump it to 33-34 depending on conditions.
    watch the paint hit the panel, don't focus on where your hand is. and do a practice panel first.
    b marler

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