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I imagine it can take a few days if you're doing this on a body. I sometimes stretch a spruce piece into a long thin piece that I glue and tuck into a corner or wedge with a hobby knife to simulate a weld. It took two days to harden up using model glue, it might have been faster with CA glue but I wanted to be able to intentionally wedge it to look like a weld.
I'd echo what mississippivol and PJ have already stated. I made my own "sprue-goo" out of a small amount of Flex-i-file glue and a lot of styrene pieces, its got the consistency of thick snot and dries fairly fast. I've not had the problem of staying soft.
On the Bench: Lots of unfinished projects!
Let's say a gap along the wing to fuselage join. Stretch out some sprue then fill in the gap with the streched sprue and run Tenax along which will melt the plastic and take care of the gap. Just one of the many methods available.
Too many models to build, not enough time in a lifetime!!
If it's still soft, you might not have put in enough shavings. I've used the technique before with good results, but the super glues, putties, and some of the newer stuff out there are more convenient to use.
Has anyone used bits of plastic in liquid cement as a filler? It stays soft days after you use it. How long should one wait or is this just a bad technique?
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