There ARE differences in PVC cements. For 10" pipe you should NOT use standard Oatey general purpose cement. What you want is Heavy Duty PVC Cement. It's more viscous (I think it has more PVC solids in it). The suggestion of "Heavy Duty" is not speculation: look at Oatey stuff on-line, or the
Aetna Plastics selection guide. Note that CPVC cement is a different product. Use heavy-duty CPVC for that type of pipe. The higher solids fills in cracks better, and presumably this will give you a better physical joint and seal.
You may wish to use medium set vs normal, if you need more working time. Priming is really, really important when using heavier-duty cements. Primer softens up and cleans the surface. A cement with higher solids and less solvent can then bond strongly.
So. Cut cleanly, deburr the pipe, clean both pipe and cap scrupulously, make sure that you prime, and use heavy duty cement (pvc or cpvc as appropriate). BTW, gray or clear cement doesn't really matter much. When you assemble, hold the cap on with significant pressure for a couple of minutes. This avoids expansion forces and what have you from pushing the cap off a bit. Wipe off excess cement to avoid etching the pipe wall.
Not to be a know-it-all but are you saying that you are gluing a 10" PVC cap onto a schedule 40 pipe? The pressure rating for that is 140psi at 73°F. Note that PVC is strongly de-rated at higher temperatures. At 140°F is 0.22, giving you a rating of about 30psi. If using higher than ambient pressures, I suggest CPVC (at 140°F it's correction factor is 0.5).
Because you're higher than 15psig, if the pipe is more than 30 feet long (probably not!), the ASME Section VIII Bioler and Pressure Vessel code applies. That would require a pressure relief device. If your pressure source is a compressor setup that generates higher pressures (like 100psig), so that a regulator failure gives you full pressure, I'd have a relief device on the thing if there's any chance of getting up around the 140psig rating. You've read stories here on PM about people using PVC for shop air and having it explode. If pressure excursions were frequent, a relief valve reseals but leaks a bit. If excursions were almost never observed, a rupture disc would have almost nil leakage. But if you had an "incident", you'd have to replace the disc, and they're not cheap.
Sorry for the arc into likely non-related design considerations. But the big thing is: use heavy duty cement on a 10" pipe.