You can use either "permatex aviation form-a -gasket #3" or "loctite aviation #3" both these products are a liquid type gasket sealant and are petrol,oil,water and anti-freeze safe,they can also be used on pipe and thread seals.I have been using them for years on many different engines and applications with no problems and great results as you can see they are designed for aviation uses as well.You can get these products from just about any spare parts shops even super cheap have them now.They were originally recomended to me by a mechanical engineer and are tried and proven products.Good luck with tour install cheers.