When tenting very large holes or slots, it is helpful to expose near the higher side of the exposure tolerance. By exposing to a step 9 to 10 as last step held, it will strengthen the resist and maximize performance. Cross linking of resist begins upon exposure and continues for 15 to 30 minutes. Holding the resist from 15 to 30 minutes after exposure prior to development causes a noticeable increase in tenting reliability. If developed without the suggested hold times, the resist is only partially polymerized and will cause the larger tents to pucker.
Heated developers play a roll in tenting by softening the resist.
Regularly scheduled preventative maintenance is required in developing to assure that no nozzles are partially plugged which would cause high pressure streams of developer to impinge upon the tents. Common developer setups are fan nozzles in both the first and last bank focused inward to the center of the machine and cone nozzles in all other locations. Checking the nozzles each time the developer is changed is a good practice and will avoid difficulties. Consult your local and federal authorities for disposal requirements in your area. Rolls are packaged 2 rolls per box.