My 92 honda accord transmission only slips when it gets hot

In this case, you stand a 50/50 chance at saving your transmission by doing a flush. When performing these, either your transmission is better or worse than original. We would suggest that you bring it down to get it looked at, however, most likely replacement of transmission.

If the transmission has been serviced, filter and fluid, you likely have an internal clutch problem. Have that checked by someone that knows how the magic smoke works in that thing, honda's like to eat transmissions because they're often a very forgotten service. Yet a very important one