All the 243 i've seen is blue and is blue on the loctite website?
242, 243 & 248 are all very similar in terms of holding strength, 243 & 248 can cope with a small amount of oil residue on the surface where as 242 requires clean surfaces to achieve maximum adhesion.
242 & 243 are both liquid where as 248 looks like a tube of prit-stick glue which can make it easier to apply
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