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How to pour soft plastic lures...

3089 Views 16 Replies 9 Participants Last post by  Alan Banks

If you have been following my guides you will now know how to make a simple one piece silicone mould. So now I am going to show you how to pour your lures and soon get fishing with your new flexible friend...

The base material you will be using for this is Liquid Plastic. This thin milky liquid requires heating to around 170°C for it to change into a clear and slightly thicker liquid, that when poured into your mould and allowed to cool will form your finished soft plastic lure. When buying liquid plastic you can choose what hardness you require for your lure depending on the application. For worm or slug type lures for example you will probably want to use a soft plastic and for shads you may want something a bit firmer. You can also customise the hardness of Liquid Plastic if you wish by adding softener or hardener at around 10 to 20%. These additives must be mixed into the liquid plastic before heating.

As you are going to be heating the plastic to a high temperature it is important to make sure you are wearing suitable clothes and some basic personal protection. Any spillages that may happen could result in some nasty burns so it is essential to be wearing heat resistant gloves, which will also protect you when handling hot tools. It would also be a good idea to wear some goggles just in case some spilt plastic ends up a bit higher. Lastly you will find that when heating the plastic it will give off some fumes, so only do this in a ventilated area and ideally wear a respirator to protect your lungs.

The next step is to decide how you are going to heat your liquid plastic. The most common and easiest method is to use a microwave which is what I am going to explain how to use here. It is probably a good idea to use one that you won't be cooking food in as the other half might get a bit upset. The other heating method is to use a pan on the hob but it can be quite hard to control the heat and requires constant stirring to stop the plastic burning on the bottom, this in turn can add unsightly bubbles into the plastic so I wouldn't recommend it. When heating liquid plastic it is best to not do it too fast or too high as this can cause overheating and will result in the plastic turning yellow, or at worse totally burning into a black unusable mess.

The items needed to make your soft plastic lures are as follows:

1. your pre-made moulds
2. a bottle of liquid plastic
3. some liquid colours
4. some heat resistant glitter
5. one or two fine spouted microwave safe glass jugs
6. a stirrer - metal is best as wood can cause bubbles
7. some scents
8. grip seal bags

Before you start first check the bottom of the bottle of liquid plastic, as some of the material can settle there. It is important to ensure that the plastic is fully dissolved as if it is not you may find that the finished lure is too soft. So give the bottle a really good shake for a couple of minutes, if there is some that is stuck to the bottle and will not dissolve then you can help it along by carefully pushing the edges of the bottom inwards to release the material. When you are happy that the plastic is ready then now it is time to pour some into a microwave jug. I usually start with about 150ml.

Next step is to begin heating the plastic. Now the amount of time this takes will vary depending on how powerful your microwave is and how much plastic you are heating. A little bit of trial an error is needed at first until you get used to do it. As mentioned before it is really important to not heat the plastic too quickly as this will cause it to burn and turn yellow, which is not what we want so take your time.

It is also best not to heat using full power as this will make heating hard to control so use a lower setting. I usually start by using my microwave on 75% and heat for 1 ½ minutes, then take the jug out of the microwave and stir the plastic.

You will notice that the plastic is starting to go clear but is very thick and quite lumpy, so time for a bit more heat. I put it back in for
another 45 seconds on 75% power. Remove again and stir. It should now be about the consistency of vegetable oil. If there are bubbles in it then I pop it back in the microwave and heat for another 45 seconds on 50% power. This time the plastic should come out perfectly clear and almost totally bubble free.

The next step is to add some colour to the plastic. Always shake the bottles of liquid colour before using and add just a couple of drops to begin with and stir in to the hot plastic. The colours are very concentrated so you will not need a lot and the more you add the more opaque the plastic will become. If you want a very translucent colour then it is best to add a few drops to the plastic before heating, fluorescent colours must always be added this way. Also all colours can be mixed together to get the exact shade you want and with a little bit of experimenting you can come up with some amazing effects.

Here I have just added some Motor oil which is a clear dark green colour.

Next step is to add some glitter which will give your lures a sparkle in the light. You can only use heat resistant glitter when making lures as the hot temperature of the plastic will cause normal craft glitter to shrink to almost nothing and even bleed colour into the plastic. Also do not use aluminium based glitters as if you heat the plastic again in the microwave this may cause sparks and the plastic could catch on fire.

Stir in the glitter…

If at any point the plastic has started to cool and thicken then heat it up some more on 50% for 30 seconds, remove and stir again as the glitter may sink to the bottom.

Now it is time to pour the plastic into your moulds. Again take your time and pour in a nice thin stream in one go. This can take a few goes to get it right and not overfill the cavity but once you have done it a few times you will get a perfect pour every time. If you want to make a two coloured lure then heat two jugs of plastic and colour separately, pour some of one colour into the cavity first and then pour the other colour on top.

Once poured you must allow the plastic to cool for about 5 minutes or so before removing from the mould and is best to let it totally cool down. Do not be tempted to pull it out if the mould too soon as this can distort the lure if not cooled properly and also you run the risk of burning yourself on it.

and there you have a finished lure...

Sometimes you may find that the surface of the lure looks slightly pitted. I am not exactly sure what causes this but I have found that applying a very thin coat of lure lube to the mould with a paint brush before pouring, will prevent this and gives your lure a glossy finish.

When you have a few made it is best to store them in a grip seal bag. Try to store only the same colour in one bag as some colours can leach into each other. You will find if you put them into the bag as they are they will stick together, so it is a good idea to add a couple of drops of lure lube to the bag to prevent this. Also this is a good time to add liquid scents to the bag which will penetrate the lures when left for a few hours.

The final step is to stand back and admire your work... then get out there and catch some fish on your very own creations… :)
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Mmmmm, I like the look of them Alan, but you forgot to leave me any to try the other night, I am going to have another bash Saturday if interested. :-D
Nice and informative! i'd sticky your threads, and i dont mean :spoo:
Thanks for posting your steps by steps Alan. They will be of great help if i ever get around to making my own SP lures.
Just added a revised version as there were some bits missing.. :)
Great guide Alan,on average how many sp lures would you get from a 150ml pouring ?
150ml = Bloney loads!!!, but then it depends on size of lure, that will make about 150g or lures, so if your lure weighs 10g then you get 15 and 10g is fairly large, like about 6 inch stick bait kind of size. Standard Xlayer about 6g from memory, work it out...
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remember that heavily salted lures weigh more if you copied a salted lure and are weighing it, it takes less weight/volume of plastic to make the lure than it's salt laden weight if that makes sense.
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Exactly what Andy said :) Most of my lures are around the 10g mark, so a little plastic does make quite a few lures.
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Thanks Alan ,just need to convince the other half that a sp kit is a worthy birthday present now :rolleyes:
Well just make sure you tell her that you can make at least 100 soft lures for less than the price of one hard lure :)
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Can scent be added into the plastisol ?? If so is this done before or after heating ?? Thanks
Can scent be added into the plastisol ?? If so is this done before or after heating ?? Thanks
Ive always added mine after Nick,just put your lures in a clear plastic bag and add some scent drops. Not sure if you added before wether heating it with the plastisol would destroy the scent .
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If you are purchasing scents from my site, I would certainly recommend adding aniseed to bag after the lure have cooled as this can evaporate off when added to the hot plastic. Garlic and shrimp seems to work ok when added to hot however. To be honest though I am the same as Rob, I usually tend to add them at the end as they will soak into the plastic when left for a while.
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