Is that epoxy resin or polyester?
If its epoxy I have learned that the mixing requirements are very specific because of some issues I had on my build.
This is what I learnd after talking with UScomposites tech support for about 20min.
1. When mixing into your cup, add/ pump hardener first, and spread it around the sides etc. You don't want the resin touching the walls, becuase it won't get any hardener to it, and therefore never cure correctly.
2. DO NOT VARY from the ratio. Be very careful with your measurements. If cold, do not use pumps because the resin is too frim to pump propperly. If you over harden, the mixture will be rubbery once it cures. To little and... it doesn't cure correctly.
2.5The ambient temprature for the first two hours is critcal for propper curing. Anything over 50 is ok. If necessary, use a heat gun under the mixing bowl to help facilitate the chemical reaction.
3. Mix/ stir the resin and hardener for 5 min. at the mininum. It takes that long to get the it mixed propperly ( I was mixing for 1 min or less.)
Hope this helps... also, if you don't want to grind, scrape all that resin off, you can use a cloth soaked in Acetone and wipe away the rubbery layers, assuming its hardened in some areas and not others. If its rubbery all over you may be hosed.
And if its polyester resin..... I got nuthin.