If you use a tanning bed ONE DAY after putting on self-tanning cream, will the cream ';block'; the rays or?

...Will your skin get darker? Will the sweat (when you're on the tanning bed) worsen the look of the skin by making striates?If you use a tanning bed ONE DAY after putting on self-tanning cream, will the cream ';block'; the rays or?
The tanning creams do not contain any sunblock, so no, it won't ';block'; any of the rays. The self-tanner will put the colour on your skin, and the tanning bed will do its own job. The sweat will only cause streaking if the self-tanner you used had a bronzer in it that you have not washed off yet. This won't affect your actual tan at all... once you shower, the bronzer will wash off, and your tan will be as even as possible (so long as you applied the faux tan right and didn't cause any streaks at that point).