Are there any problems with the preparation of this HPMC gel? Hydroxypropylmethylcellulose 4% Propylene glycol 20% water ad 100g

This is a formula well known in hospital Center. The preparation is quite simple: Rub into tarred recipient (+ spatula) HPMC 4000 with propylene glycol and add freshly boiled water to 100g; Mix and let cool; Check the weight and replace the evaporte water; Let it swell in the fridge overnight.