Thompson's water seal and the clone products are just paraffin wax dissolved in solvent naphtha and petroleum distillates. As the volatiles in the naphtha and distillates evaporate they leave behind the wax and oil residues contained in the distillates that never dissipate. Personally I would not want to expose any of my animals to these residues.

While the name may imply that it is a water "sealant" it really is nothing more than a temporary water repellent and the manufacturer's recommend regular repeat applications to maintain the water repellent benefits, if you can call it that. I won't even use this stuff on my deck. Thompson's is an example of superior marketing of an inferior product.
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BigT
There is a difference between ignorance and stupidity. The ignorant can be taught, stupidity is beyond our control.
1.2 P. m. melanoleucus B/W N. J. Northern Pines
1.2 P. d. deppei Mexican Pines
2.2 P. l. lineaticollis Linis or Lined Pines
1.2 P. m. lodingi Black Pines
0.3 P. c. sayi red bulls
1.1 Drymarchon melenurus Blacktail Cribo
1.2 D. corais Yellowtail Cribos
1.2 M. s. cheynei Jungle Carpet
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1.1 L. g. californiae B/W Cali kings
0.0.3 M. f. flagellum Eastern Coachwhips
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