porkmeatballs Posted February 7, 2023 Report Share Posted February 7, 2023 Hello everyone! It's been a while since I posted on this site, but I recently ran into a problem when trying to mold a bait. I recently carved a new lure and then primed it using a gloss Krylon spray paint. It looked great and I had high hopes as I went to mold it using platinum cure silicone. I waited 12+ hours for the silicone to cure just to be safe, but when I opened the mold the entire surface of the master hadn't seemed to cure. The rest of the mold had cured perfectly, but the surface of the bait had a thick coat of uncured silicone on it. Any ideas on what caused this? One of my ideas is that the Krylon hadn't completely outgassed prior to me pouring the silicone, which then led to cure inhibition. The rest of the mold/surfaces cured perfectly, it was just the surface of the bait that had problems. If it is a problem with the Krylon spray paint, how long does it take to completely outgas? I have successfully used the same paint to cover previous baits, but I didn't mold them until quite a bit after they were coated. Any thoughts would be appreciated before I waste even more time and silicone Quote Link to comment Share on other sites More sharing options...
Anglinarcher Posted February 16, 2023 Report Share Posted February 16, 2023 Platinum cure reacts to some chemicals and won't set up. If it has Sulphur for example. Cover the Krylon with another clear and give it another try. 2 Quote Link to comment Share on other sites More sharing options...
Flaswimbaiter Posted February 19, 2023 Report Share Posted February 19, 2023 I would be best to seal with superglue, polyurethane or clear coat. I have molded all three with no issues. Clear coat is the best, but washes out the details. 2 Quote Link to comment Share on other sites More sharing options...
porkmeatballs Posted February 20, 2023 Author Report Share Posted February 20, 2023 I'm currently trying to wait for any other fumes to outgas from the master and will try placing a small amount of silicone on top to see if I still have problems. If that fails I will definitely try to clear coat it with something before trying again. Thanks for the input! Quote Link to comment Share on other sites More sharing options...
AZ Fisher Posted February 20, 2023 Report Share Posted February 20, 2023 Dave, I have used the Rustoleum 2X matte clear for sealing at least ten baits that I molded and had no curing issues with the silicone. I do about 3 light to med coats and it doesn't seem to fill in much detail. Again, I normally say stay away from Rustoleum products, but this one has worked for me. I let the matte clear dry and off gas a few days in the sun I have been using Smooth-On 29NV and Sprayway #946 Silicone release agent. I've always waited only and hour or two past the cure time to unmold the master. Hope you get'r figured out... 1 Quote Link to comment Share on other sites More sharing options...
porkmeatballs Posted February 20, 2023 Author Report Share Posted February 20, 2023 3 hours ago, AZ Fisher said: Dave, I have used the Rustoleum 2X matte clear for sealing at least ten baits that I molded and had no curing issues with the silicone. I do about 3 light to med coats and it doesn't seem to fill in much detail. Again, I normally say stay away from Rustoleum products, but this one has worked for me. I let the matte clear dry and off gas a few days in the sun I have been using Smooth-On 29NV and Sprayway #946 Silicone release agent. I've always waited only and hour or two past the cure time to unmold the master. Hope you get'r figured out... I believe the Smooth-On 29NV is a tin cure silicone, correct? I have also used tin cure silicone for a while and have had zero issues with this particular Krylon spray paint. I only began to run into problems when I switched to this new platinum cure silicone. I think that platinum cure is much more sensitive and can be inhibited by a wider range of substances/materials... Quote Link to comment Share on other sites More sharing options...
AZ Fisher Posted February 20, 2023 Report Share Posted February 20, 2023 Yep, it is tin cure, I thought the opposite... Quote Link to comment Share on other sites More sharing options...
jigmeister Posted March 1, 2023 Report Share Posted March 1, 2023 Tin cure is not only expensive it's very prone to reacting to whatever it is in contact with when curing . It is best to mix up a small amount for a test to see how it reacts to the surface of whatever you're trying to mold . 1 Quote Link to comment Share on other sites More sharing options...
porkmeatballs Posted March 6, 2023 Author Report Share Posted March 6, 2023 Update: I waited a few weeks for the Krylon to outgas and attempted another mold. It seems like it turned out pretty well! I guess I was a bit too hasty at first and should have let the Krylon fully cure first. Now I know haha Quote Link to comment Share on other sites More sharing options...
mark poulson Posted March 6, 2023 Report Share Posted March 6, 2023 6 hours ago, porkmeatballs said: Update: I waited a few weeks for the Krylon to outgas and attempted another mold. It seems like it turned out pretty well! I guess I was a bit too hasty at first and should have let the Krylon fully cure first. Now I know haha Try hitting the bait with a hairdryer, once the wet look has gone away. I usually wait two hours after the final coat, and then hit it several times after that on the same day. Two days later it's ready to fish. 1 Quote Link to comment Share on other sites More sharing options...
porkmeatballs Posted March 7, 2023 Author Report Share Posted March 7, 2023 17 hours ago, mark poulson said: Try hitting the bait with a hairdryer, once the wet look has gone away. I usually wait two hours after the final coat, and then hit it several times after that on the same day. Two days later it's ready to fish. Yes I actually did use a hairdryer to help accelerate the outgassing process and then waited a few more weeks just to be safe. And just to clarify, this was for a master that I made a mold with, not a fishable bait. 1 Quote Link to comment Share on other sites More sharing options...
mark poulson Posted March 7, 2023 Report Share Posted March 7, 2023 3 hours ago, porkmeatballs said: Yes I actually did use a hairdryer to help accelerate the outgassing process and then waited a few more weeks just to be safe. And just to clarify, this was for a master that I made a mold with, not a fishable bait. If you need to seal/coat it before you pour your silicone, maybe try another coating that doesn't have a solvent base, like epoxy. 1 Quote Link to comment Share on other sites More sharing options...
porkmeatballs Posted March 8, 2023 Author Report Share Posted March 8, 2023 21 hours ago, mark poulson said: If you need to seal/coat it before you pour your silicone, maybe try another coating that doesn't have a solvent base, like epoxy. That would make sense, but I also don't want to muddle too much of the details on the master with epoxy... I have heard that some specific types of spray on clears get along nicely with platinum cure silicone, but I would have to do a bit more digging to figure out which ones. Quote Link to comment Share on other sites More sharing options...
