without mixing with bondo ? Here is my plan. I am doing an EM deer skull with the antler and part of the skull broken off. I attached 2 screws out of the bottom of the antler. I will glue the antler onto the skull with the screws protruding into the skull cavity. Then I want to pour in some resin to harden around the screw heads. I have some old resin on hand that is fairly thick (should the resin be thin?). Can I just mix some hardener with it and pour it through the spinal cord hole?
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.....Use it. For two reasons...number one, the old resin may not set up and you could have a mess. Number two if the area isn't completely sealed the resin could leak through somewhere before it sets and again you would have a mess.
The reason for the bondo/resin mix is to get the mix to flow in where you want it and then kick off fairly rapidly, before it has the chance to go somewhere it's not supposed to be. Bondo insures the fast set up.
Using just resin and it's hardener should really only be done in thin coats. Putting it on too thick will result in it never fully curing.
Bondo also gives the whole pour some structural integrity. Typically either bondo or fiberglass cloth, mat or chop (or a combination of many of the above) is used with resin to give the mixture some backbone. If you still choose to do the pour, do it in multiple pours...
Marty , I dont know where you got the idea that thicker coats of resin will not cure properly . The thicker the coats , the faster it will harden do to the heat build up of the chemical. What do you think clear casting resin is ? That gets poured in thick coats . Its thin coats that you have to watch out for . Now Jon , if your planning on using the resin to set around those screws to hold them in place , dont bother , fiberglass doesnt stick to metal and will separate down the road . We use metal molds at work and the resin comes off . Try epoxy . Rick