Car have oil leak in the rear..I went to Pepboys and i saw perm gasket sealer..
is that good to use???

 

If that sealer is the stuff in the tube, then I would not try to use it as a band-aid.

I would try to locate the source oil leak. If oil is on the back of the engine, I would try to find the highest point of oil leakage to figure out the source.

The common sources on the back of the engine from highest to lowest point are the valve cover gasket, oil sending unit, oil filter, and the oil pan.

You should be able to see the back of the valve cover to see if it is oil stained directly below it. Pull the connector from the oil sending unit and see if the plastic/rubber boot is filled of oil. Sometimes the old oil filter gasket can stick on the back of the engine block and cause a leak when you replace it.

 

That stuff only works if you actually find the leak. Then you remove what's leaking & use that stuff to re-seal it when you bolt it back on. It doesn't work by smearing it onto the outside of the engine.

 

find the leak and replace whatever is causing it

in the rear where ??? be more specific

 

It look like the oil is leaking from the VTEC Solenoid I had that replaced before..

 

Well, that can still be 3 different places...

1) where the entire VTEC spool valve bolts against the head
2) triangle flange where the VTEC solenoid bolts to the spool valve
3) VTEC oil-pressure switch screwed into the spool valve

But GOOD that you've really narrowed it down. None of those three places can be fixed by smearing sealant on the outside. But they're not too difficult to remove & buy new gaskets.