Yellowing of plastisol that’s been sitting for years

[shibby95]

I have about 5 gallons of sealed Bait Plastic plastisol and an open jug, which I used about 2 years ago making soft baits. Two nights ago, I decided to start injecting molds again, bit I noticed that after cooking the plastisol, it’s not as clear as it used to be. Now, when reheating in the microwave after the first cooking, it starts to yellow faster. Anyone have an idea why? I was told because the plastisol was old?

 

Shibby95

[Jig Man]

Have you tried reducing the heating cycles?  I find 30-45 seconds then stir works best for me.

[mark poulson]

Try adding more heat stabilizer.  

[Apdriver]

Recently, I experienced the same thing with some Calhoun’s. I had it for a long time though. Its shelf life was about the 5 year mark from what I experienced. This year it was seven years old and unusable. It wouldn’t cure and stayed tacky. Yellowed very quickly too. Threw it away and ordered new Baitplastics. 

[shibby95]

I have never used/bought heat stabilizer, does it really make a difference? I placed an order for heat stabilizer, since I have 5 gallons of plastisol to use.

[shibby95]

5 hours ago, Apdriver said:

Recently, I experienced the same thing with some Calhoun’s. I had it for a long time though. Its shelf life was about the 5 year mark from what I experienced. This year it was seven years old and unusable. It wouldn’t cure and stayed tacky. Yellowed very quickly too. Threw it away and ordered new Baitplastics. 

Yeah, my plastisol is only reaching 2 years old and I still have 5 unopened gallons. I’ll go with cooking 4 oz recommended heat for a minute and then 30 second increments. I’m just not getting that clear cooked color:

[Apdriver]

Hope the heat stabilizer works out for you. I don’t plan on letting things sit that long again. I just won’t buy that much at a time in the future. Couple gallons at a time prolly.

[alsworms]

At this point, with the plastic being so old, I'd be very careful with heat stabilizer.  That stuff can yellow new plastic.  Use it in very small amounts, but sadly it sounds like this batch is done. 

[Jig Man]

Yes heat stabilizer makes things yellow.  Use only a few drops.

[Travis]

Dark colors don't care about heat stabilizer...

For old plastic make sure it is mixed very well.  Stuff that comes out tacky has cured after a few weeks from my experiences but haven't poured much old plastic besides a few times (plastic was probably 8 years old).

[shibby95]

9 hours ago, alsworms said:

At this point, with the plastic being so old, I'd be very careful with heat stabilizer.  That stuff can yellow new plastic.  Use it in very small amounts, but sadly it sounds like this batch is done. 

That is probably the situation, but I’m able to get at least one good run, before it starts to yellow from cooking. Meanwhile, I can make glow baits, color doesn’t matter for the night fishing that I do sometimes. Thanks for the input from everyone.

[basscatlildave]

I have some really old plastic so I just make black or dark colored baits with it. 

[Painter1]

On 4/1/2023 at 8:49 PM, Apdriver said:

Recently, I experienced the same thing with some Calhoun’s. I had it for a long time though. Its shelf life was about the 5 year mark from what I experienced. This year it was seven years old and unusable. It wouldn’t cure and stayed tacky. Yellowed very quickly too. Threw it away and ordered new Baitplastics. 

I’m in the same boat with 6 old gallons.  Wondering HOW to dispose of it? 

[Apdriver]

The most environmentally friendly? Not sure. All the crap that goes into our landfills, it’s prolly not gonna make that much of a difference if you just put it in your regular trash pickup.