mixing as shall be discussed in more detail below it is important to produce a cured coating which is substantially free of air bubbles keeping the air from the final coating may be accomplished in different ways however by preparing the mixture in a machine such as the hydra cat air bubbles are effectively removed prior to application of the composition to the aeroskirt 100 or other component in addition to mixing the composition and removing air bubbles therefrom the hydra cat may be used to pump the material to its point of application it is noted that other commercial mixers may be effective in mixing the ablative composition however use of other mixers may require the use of a separate pump and pressurizer in order to degas the mixture and to pump the mixture to its point of application as stated above an alternative method of preparing the sparesyl composition is to mix it by hand hand mixing does provide the advantage of more precise measuring of the three individual components however hand mixing also tends to introduce more air into the resultant mixture to reduce the amount of air incorporated into the mixture the material may be allowed to stand for 40 to 60 minutes prior to application in order to allow the entrained air and volatile components to escape regardless of whether the composition is prepared through hand mixing or use of a commercial mixer.