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Hi, sorry but your work isnt great. I did the same last year for my son and it look lots better than that. Well done for taking the time to write an instructable though.
That depends on how it was treated. I jave read some articles that some pallets are treated with sone pretty nasty compunds but some are actually just heat treated without the chemicals. I wouldbt be drinking from these though. But they do look good
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It is true that as long as the system is insulated it will probably generate enough heat to keep itself running. Look at compost heaps and melon growing... which is often used here in the uk where temperatures are also cooler.
Not sure that neatncinditioner is very good for children to play with tbh. There are very simply platdoh mixtures using flour, salt and food colouring readily available on the internet. Why would you not use those recipes instead? your poor kids were probably safer fighting.
Is the best PCB etchant in every kitchen ?