Hello guys , Had my 1st try with MTI hose today , couldn't get the bag to vac down . Pulled everything apart and connected the MTI hose directly to the vac hose and pulled 100% vac ??   What am I doing wrong ? MTI hose didn't seem to let air through ??    Tried the traditional way with spiral and resin break and infusion seemed to go well . I will pop it tomorrow to see what the surface looks like . 

Are you sure you set it up correctly?  Sealed one end with gum tape?  Sure you had a good seal on the bag?  I noticed with the MTI hose, it takes a few seconds longer for the vacuum to be pulled through.