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Hi Curtis, It never ceases to amaze me how ignorant some paint suppliers are of the products they sell. The MP170 epoxy primer is normally dry-to-topcoat or surface in about 30 minutes (at 70 deg F). See the technical data sheet for it. I have never heard of a suggested waiting time of 12 hours minimum. In fact, after 72 hours the epoxy is so hard that scuffing and reapplying the epoxy should be done to obtain the best adhesion of topcoats. You want to take advantage of a chemical bond between the epoxy and the topcoat so stay anywhere within the time window of 30 min to 72 hrs. It will not do any harm to wait the 12 hours but it is not necessary. Again, see the tech sheet. Other epoxies are different so you can't generalize on these time periods You should be able to shoot epoxy from 60 Deg F up into the 90's. At the high end of temps you might want to consider the optional reduction with up to 10% acetone to the RTS (ready to spray) mix as indicated in the tech sheet. I have never done that, having not found it to be necessary. I haven't used it above about 85 deg however. I tend to spray on the wet side so I haven't noticed a problem with decent flowout. Try a test panel. You should do that anyway if you haven't used the products before. I have used the DX330 over plastic filler w/o a problem. Make sure you wipe the surface dry as specified in the directions. Plastic filler is porous so try to avoid any heavy application of the 330 since it is not the fastest evaporating cleaner. After wiping dry, you can pretty much tell by the appearance of the surface if additional time needs to be allowed for any further evaporation to occur. I would err on the side of allowing a liberal time for this to happen in the area of the filler. Despite what you may be advised by anyone, the best recommendations come directly from the product manufacturer and not the product salesman. That's why the data sheets are so important to have available. Get the one for MAE w/hard here.  Rod
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