Just to clarify a few things since this post doesn't really make any sense....
Tanning is a result of increased melanin production in your skin, and a darkening of their pigment.
Burning is a result of non enough of those being present to absorb the UV rays coming trhough and the radiation does damage (burns it ) to the tissue.
Tanning accelerators work by either ampifying the effect of the radiation, or they increase the amount of melanin in your skin, starting out first by incrasing the number melanocytes.
Skin cancer is frequently a case of a melanocyte (could be spelling all of this wrong) getting hit by UV radation and mutating - they are most susceptible to this when they are young - so by using a tanning agent that increases the number of these you are increasing your chances of skin cancer.
SPF is not a substance, it is a rating. It is the length of time you can be in the sun before burning with the substance on you divided by the length of time that you can be in the sun without the product on before burning.
A high SPF means that it protects the same as a lower SPF, but it does so for longer.
There is no way that anything can contain SPF, that is like saying a cigarette contains a surgen general warning.
So what you essentially asked was how you could increase your tanning ability, by blocking your ability to tan, and does anything have the ability to do this...
It was all a contradition in terms on so many levels.
That said, you can buy a cream, lotion, foam, and a spray that will basically be a tan in a bottle - it will make you look orangey tan and they in fact sometimes do also block the UV rays, so they in fact have an SPF (but can in no way contain an SPF within them since that is just not feasible).
Those for the most part don't work very well and look very obviously fake.