I use a solvent based undercoat thinned with white spirit. Though you can use polycell stain block and loads of other stuff thats sprung on the market this last decade. I just use undercoat as it's convenient, cheap and works first time every time. Dont use gloss!!!
Good luck
If you need to find a tradesperson to get your job done, please try our local search below,
or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Please select a service and enter a location to continue...
Are you a trade or supplier? You can create your listing free at DIYnot Local