Paint
I usually have had good luck with Gillespie's products. What color did you use, thinner, number of coats, drying time between coats, hardner, drying time between primer and paint. OD semi-gloss #24087 (#?) is a soft finish even with hardner. I like the lusterless paints, they appear more durable even without hardner. I let the prime dry a day or two, then apply three coats of paint allowing each coat to tack before appling the next. I'll let stuff dry over night before handling, but will take several days to dry before you can really work with it. Helps if the humidty is low.
I prefer to paint individual parts and then do a final paint after the vehicle is assembled.
Hope this helps.
Karl