Buy some fresh catalyst, mix it a little "rich" with some resin (a bit more hardener than normal). Paint it over the sticky areas and use a heat lamp for at least 24-48 hours. That worked for me when I fixed a split trundle bed drawer facing that my niece stood on. 😊

BTW you're not trying to cook it, just warm it to perhaps 100-150 degrees. So go easy on the heat.