On 8/9/2018 11:14 PM, Andy wrote:
I had to repair a flat. Have some questions.

Is it best to apply patch to a completly flat tube?

No. Put a little air in the tube. Use the proper size patch, i.e. a
large patch on a small width tire is a bad idea. Rema makes patch kits
with different size patches http://www.rematiptop.com/parts.php?sid=4.

I found a small copper wire in tire.

Is there something to minimize what can puncture tire?

It's better to use a quality flat-resistant tire, like the Schwalbe
Marathon Plus
https://www.schwalbetires.com/bike_tires/road_tires/Marathon_Plus_HS440,
than to use a tire liner. There's a weight penalty for these tires, but
unless you're racing, the time you'll save in fixing flats is probably
more than the time you'll lose from the greater weight.

Avoid Mr. Tuffy liners at all costs. If you do use liners, use a thicker
inner tube because the liners tend to cause flats where the two ends meet.