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Topic starter
18/04/2021 7:20 pm
I have a Brooklin 1954 Cadillac, colors copper and driftwood, which I purchased last October. I have a question about the tires. Though I now display many of my models slightly elevated to minimize flat spots developing on the tires, I do not do it for this one. I removed the model from the base provided by Brooklin and display it on a shelf, resting on a thin piece of clear plastic. I noticed a liquid substance at the contact point of each tire. It seems the weight of the model is squeezing the liquid out of the tires. I have never seen this on any of my other white metal models, which are displayed resting on their tires. Have any of you ever seen this?
Ed Davis
Inverness, Illinois, USA
18/04/2021 10:38 pm
Sorry, but I can help, Ed. Several years ago I would have a model develop flat spots, but then I started resting models on dominoes. That worked, but it seems the newer tires don't often go flat. I wonder if you have an excessive moisture problem in your display area. Good luck! David 
18/04/2021 11:40 pm
I believe the tire is reacting with the plastic, IMHO.
Karl Schnelle and Karl Schnelle reacted
19/04/2021 1:47 am
Unfortunately this problem has happened lately on several models (I have it on the Alfa Romeo's). All my models on display have a little wood block underneath to keep them higher, but this does not prevent the melting of some tyres in the later models. I know Brooklin had a problem with a suppier, which has been changed, and now tyres should be OK.
I suggest that you contact Amanda at Brooklin and she will be able to help you.
This post was modified 5 years ago by Gianluigi Cappi
19/04/2021 8:39 am
Lloyd is likely correct. I have even seen vinyl tires react with the clear finish on wood shelves.
19/04/2021 1:40 pm
I have a Brooklin 1954 Cadillac, colors copper and driftwood, which I purchased last October. I have a question about the tires. Though I now display many of my models slightly elevated to minimize flat spots developing on the tires, I do not do it for this one. I removed the model from the base provided by Brooklin and display it on a shelf, resting on a thin piece of clear plastic. I noticed a liquid substance at the contact point of each tire. It seems the weight of the model is squeezing the liquid out of the tires. I have never seen this on any of my other white metal models, which are displayed resting on their tires. Have any of you ever seen this?
Hi Ed
This is a chemical reaction with two different types of plastic as noted by both Lloyd and Harv.
I have seen this where different plastics have been used for the hub and tyre. This is fairly common in toys and models
Also I have noticed a clear liquid underneath certain vinyl type tyres where they are in contact with glass shelves.
So two options available raise the model on blocks so tyres are not in contact, I can see you use this method to avoid flat spots on tyres, or ensure paper is used between the tyres and the base.
Hope this helps.
Chris
Autominologist residing in the Robin Hood County
Nottinghamshire England UK
19/04/2021 6:32 pm
I have a Brooklin 1954 Cadillac, colors copper and driftwood, which I purchased last October. I have a question about the tires. Though I now display many of my models slightly elevated to minimize flat spots developing on the tires, I do not do it for this one. I removed the model from the base provided by Brooklin and display it on a shelf, resting on a thin piece of clear plastic. I noticed a liquid substance at the contact point of each tire. It seems the weight of the model is squeezing the liquid out of the tires. I have never seen this on any of my other white metal models, which are displayed resting on their tires. Have any of you ever seen this?
...This is a chemical reaction...
True.
I've solved this by using a tiny piece of Bare Metal Foil. A piece no larger than the area where the tire contacts the base it's reacting with.
Kitchen foil will also work. But the adhesive on one side of the BMF helps in its placement.
If the foil being visible is an issue, it can be touched up with a marker or Sharpie.
19/04/2021 9:17 pm
Mine are on glass and seem to be fine. Am I fooling myself?
Retired in Dunedin, Florida.
20/04/2021 1:02 am
Hi Guys
Not sure I know the real reason this happens, but this is my spin on the tire situation. The PM guy (Lloyd A) used PVC and then switched to Santoprine to make tires. The PVC will degenerate and out-gas over time. Not sure what happens to Santoprine. This is what eventually makes the tires sticky and melt other plastics. It also melts most waterslide decals that have been applied. Not sure if this because the tires were not molded correctly or just the nature of the tire material. Basically some sort of chemical breakdown, like several guys have mentioned. I have the Arburg C4 machine that PM (and maybe MC) used to make tires. Lately been kind of interested to see if we could make tires. More of a science project (another name for a waste of time) than anything else. Attached is a couple pics of the Arburg, some old PM tire molds and our attempt to maybe make a HW drag bus tire mold.
JD
20/04/2021 8:57 am
This problem occurs more frequently than many tealize. It's best to loosen those models that come on plastic plinths and to raise those that don't There have been several good ideas mentioned here. Another one is to use bottle caps or dominoes under the chassis.
John Kuvakas
Warrenton, VA
Topic starter
20/04/2021 1:36 pm
All, I want to thank you for your replies to my post. I found the discussion very interesting and informative.
Ed Davis
Inverness, Illinois, USA
20/04/2021 5:51 pm
Although a little late, I respond to everyone because I have experienced this issue on 3 new Brooklin models purchased last June through August. Two of them had black-wall, one of them had while-wall tires. More amount of oil was squeezed out from the black-wall tires than white-wall tiles.
Last June, I asked Amanda by eMail about it. Her reply was Brooklin recently changed their tires and the supplier had used different materials on the inner and outer rubber. That caused the chemical reaction between them. Brooklin was in ongoing talks with their tire supplier to resolve the problem. I received the replacement set of tires from her.
I am sure this had been resolved last year but I assume we may still receive some models produced last year with problem tires mounted from the dealers or even from Brooklin based on my experiences.
Oily tires seep an oil at the inner and outer rubbers' internal contact surface even if you raise the model from the base so the tires are not directly touching with the base. But you can avoid another chemical reaction between the tire's outer rubber and the base such as plastic. No such kind of chemical reaction occurs if the models are displayed on the glass surface.
If your Brooklin comes with the tires with a deep side-tread pattern, regardless of black-wall or white-wall tires, that is a good sign of goodness because the oily tires did not have a noticeable tread pattern on the side-wall.
20/04/2021 8:01 pm
This problem occurs more frequently than many tealize.
John, is the word tealize a new word that blends tease and realize? interesting. 