i re-did deck under my cuddy & used west epoxy. it adhered to to old poly very well. to me it is easier to work with because of very predictable working times. every time i used polyester it would "kick" either too fast or way to slow. the main drawback to eposy is if it is exposed to sunlight, you have to paint it. polyester can be gelcoated when completed. also if you use the MAS system, there is no blush to wash off. i also like to pumps to keep the ratio correct. i keep the pumps in the bottles all the time in my shed. if i am doing a little project i can just pump out what i need, mix it in a tuna fish can & slap it on.
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