Oven ramp-up time, how does it effect cure?

[sdold]

Hi folks! Hope everybody is having a great thanksgiving week.

I'm building an oven similar to the one Viper59 built here:

http://www.stivermotorsports.com/id44.htm

(thanks for the inspiration Jim) but I do not have 220V available. Therefore I am making a few changes to hopefully enable me to run the oven on 120V:

1. Making the oven smaller (internally it's 40" long x 20" wide X 36" high).

2. Using 5052 aluminum.

3. Building the interior so that it is insulated from the studs using the 1" wide insulation tapes.

4. Using multiple 120V elements, using two or more circuits.

My main question is this: Does it cause any problems or defect in the finished product if the part is placed in the oven cold, and it takes 20-30 minutes to get from cold to the proper cure temperature? I don't think this thing is going to be heating up super-fast on 120V, and with the top-loading lid, pre-heating the thing isn't going to do much good.

Thanks! - Steve

This oven will be used mainly for newly-assembled bike frames, or for paint storage if it does not work as an oven

[pickleboy]

hey bro it will be fine. i never preheat my ovens and have had great luck. the only time i put into a hot oven is when i hot shoot clear. as long as it will hit the cure temp and hold it for 20 min its good.

[tavo1765]

This is a good question. I always pre heat my oven up to 400f and let it soak the heat at that temp. for 30mins. This way I know my oven is at the correct operating temp, Parts come out smoother and more uniform.

Placing parts in a cold oven allow the part to sit in longer then they are supposed to be so curing problems might occur. A part will be cured before it gets to temp because it starts to flow out when it reaches 300f, not that some colors like the ramp up, like lighter colors or clears.